Sunday, September 29, 2013
led street lighting made in China: The indicator and performance of Led street light
led street lighting made in China: The indicator and performance of Led street light: LED street light is the most important performance index is its photosynthetic efficiency as a whole. A whole photosynthetic efficiency is...
The indicator and performance of Led street light
LED street light is
the most important performance index is its photosynthetic efficiency
as a whole. A whole photosynthetic efficiency is output flux (lumens)
and the ratio of the input electric power, the unit is the number of
lumens per watt lm/W.
It not only includes the luminous efficiency of the LED itself, also includes the constant current power supply efficiency and blister light transmittance. In addition, also its color temperature, color rendering index, etc.
In order to test the index of the LED dome light, we usually put it in the large integral ball, in order to measure all the luminous flux emitted from it. And analyze the spectrum emitted from it.
Now take the infrared remote control is shown in figure 7 LED to absorb dome light, for example, test its performance. This is a used 168 3014 the infrared remote control led to absorb dome light.
When not mask the measured results are as follows.
1. The whole light efficiency
The total number of lumens 1383 lm, the input ac power = 16.57 W, so the overall lighting = 83.46 lm/W to be sure which includes two efficiency, the efficiency of an infrared receiver, the other is a constant current power supply efficiency. And the efficiency of the constant current power supply, separate test results is 89.5% (figure 8). Infrared receiver power consumption is about 0.5 W, so the actual input power should be 16 W. If it’s not the infrared remote control, its overall photosynthetic efficiency should be 86.43 lm/W. If we consider the efficiency of power supply, with electric power on LED 14.32 W.
So it can get 96.5 lm/W. This should be the LED luminous efficiency of itself. If use the LED luminous efficiency is 120 lm/W, so its overall photosynthetic efficiency can reach 107 lm/W, power consumption, even with infrared receivers whole photosynthetic efficiency also can be more than 100 lm/W.
2. The color temperature
Color temperature: 6171 k, this is completely determined by the LED, if the user requires low color temperature, can convert low color temperature of LED.
3. The color rendering index
According to index: Ra = 76.2, the index is relatively low. But in reality currently used color rendering index is on 15 kinds of monochromatic light color rendering index of average results, it is not entirely represent its color. So the lighting information committee (CIE) is not recommended to determine the color of LED street light with CRI ability.
4. If combined with mask, its photosynthetic efficiency will, of course, decreases as a whole. And will reduce a lot. So choose high light transmittance of the mask is very important. But high light transmittance, will enable users to see the light bead, this is also don’t want to. Especially if use 1 w high power LED, is even more apparent, USES the small power leds used (e.g., 3014), allows for high light transmittance of mask, it is also very important.
More info you can visit:http://www.lighting-ledlight.com
It not only includes the luminous efficiency of the LED itself, also includes the constant current power supply efficiency and blister light transmittance. In addition, also its color temperature, color rendering index, etc.
In order to test the index of the LED dome light, we usually put it in the large integral ball, in order to measure all the luminous flux emitted from it. And analyze the spectrum emitted from it.
Now take the infrared remote control is shown in figure 7 LED to absorb dome light, for example, test its performance. This is a used 168 3014 the infrared remote control led to absorb dome light.
When not mask the measured results are as follows.
1. The whole light efficiency
The total number of lumens 1383 lm, the input ac power = 16.57 W, so the overall lighting = 83.46 lm/W to be sure which includes two efficiency, the efficiency of an infrared receiver, the other is a constant current power supply efficiency. And the efficiency of the constant current power supply, separate test results is 89.5% (figure 8). Infrared receiver power consumption is about 0.5 W, so the actual input power should be 16 W. If it’s not the infrared remote control, its overall photosynthetic efficiency should be 86.43 lm/W. If we consider the efficiency of power supply, with electric power on LED 14.32 W.
So it can get 96.5 lm/W. This should be the LED luminous efficiency of itself. If use the LED luminous efficiency is 120 lm/W, so its overall photosynthetic efficiency can reach 107 lm/W, power consumption, even with infrared receivers whole photosynthetic efficiency also can be more than 100 lm/W.
2. The color temperature
Color temperature: 6171 k, this is completely determined by the LED, if the user requires low color temperature, can convert low color temperature of LED.
3. The color rendering index
According to index: Ra = 76.2, the index is relatively low. But in reality currently used color rendering index is on 15 kinds of monochromatic light color rendering index of average results, it is not entirely represent its color. So the lighting information committee (CIE) is not recommended to determine the color of LED street light with CRI ability.
4. If combined with mask, its photosynthetic efficiency will, of course, decreases as a whole. And will reduce a lot. So choose high light transmittance of the mask is very important. But high light transmittance, will enable users to see the light bead, this is also don’t want to. Especially if use 1 w high power LED, is even more apparent, USES the small power leds used (e.g., 3014), allows for high light transmittance of mask, it is also very important.
More info you can visit:http://www.lighting-ledlight.com
Saturday, September 28, 2013
led street lighting made in China: 100w led street light made in China
led street lighting made in China: 100w led street light made in China: The Specifications of LED Street light 100W: Power (W) : 100 watt Dimension: 700*346*120mm ...
100w led street light made in China
The Specifications of LED Street light 100W:
Power (W) : 100 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: 160w led street light made in China
led street lighting made in China: 160w led street light made in China: The Specifications of LED Street light 160W: Power (W) : 160 watt Dimension: 700*346*120mm ...
160w led street light made in China
Power (W) : 160 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: 200w led street light made in China
led street lighting made in China: 200w led street light made in China: The Specifications of LED Street light 200W: Power (W) : 200 watt Dimension: 700*346*120mm ...
200w led street light made in China
The Specifications of LED Street light 200W:
Power (W) : 200 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: led street lighting made in China
led street lighting made in China: led street lighting made in China: Why choose our LED Street light ？ 1.high heat conducting efficiency, low lumens depreciation, high light purity, and no double ...
led street lighting made in China
Why choose our LED Street light？
1.high heat conducting efficiency, low lumens depreciation, high light purity, and no double image
2.IP65 standard, free from water, dust and corrosion
3.Breadth working voltage, and constant flow and pressure
4.Environmental protection, no pollution of lead and Hg
5.The decorative effect is wonderful,surface adopted special process.
The Specifications of LED Street light 160W:
Power (W) : 160 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
Power (W) : 160 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: Technical analysis of the LED fluorescent lamp rep...
led street lighting made in China: Technical analysis of the LED fluorescent lamp rep...: 1, the common fluorescent lamp: On both ends of the fluorescent lamp with a filament, inside the tubes filled with tiny amounts of argon a...
Technical analysis of the LED fluorescent lamp replacing common fluorescent lighting lamp
1, the common fluorescent lamp:
On both ends of the fluorescent lamp with a filament, inside the tubes filled with tiny amounts of argon and the thin mercury vapor, tube coated with fluorescent powder, on the wall between the two filament gas when conducting an ultraviolet, the fluorescent powder making soft visible light.
Characteristics of the fluorescent lamp, LED street light began to ignite need a high voltage, normal light allows only by small current, the voltage is lower than the voltage at the ends of the tube.
On both ends of the fluorescent tube is equipped with a filament, glass tube wall coated with a layer of thin fluorescent powder evenly and tube is pumped into the vacuum after the 10-3-10-4 mm hg, filled with a small amount of inert gas, also injected liquid water trace amounts of silver. Is a core inductance coil inductance ballast, the inductance of the nature is when the current in the coil change, will cause the change of the magnetic flux in coil, thus produce inductive electromotive force, the direction and the current in the opposite direction, thus hindering the current changes.
Electric fluorescent starter switch role in the circuit, it consists of a neon tube and a capacitance in parallel, and the role of the capacitor to eliminate the power supply of electromagnetic interference with ballast tank formation, and increase the voltage amplitude of the start pulse. An electrode in the discharge tube with double metal composition, using NaiPao discharge heating, make the bimetallic strip when open and close, cause the inductance ballast current mutation on both ends of the tube and generate high voltage pulse.
When the fluorescent lamp after access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, then the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role.
image4
2, LED fluorescent lamp:
LED fluorescent lamp with high quality, durable, energy saving as the main characteristics of the projection point of the adjusting range is big, the brightness of the 15 w is equivalent to ordinary 40 w fluorescent lamp. High temperature resistance, moistureproof and waterproof, prevent leakage. Using voltage: 110 v, 220 v optional, outer garment optional glass or PC material. Lamp holder and common fluorescent lamp.
LED fluorescent lamp adopts the latest LED light source technology, digital design, power saving more than 70%, the 12 w LED solar light intensity is equivalent to 40 w fluorescent tube (for the starter and ballast, 36 w fluorescent lamp real power consumption for 42 w to 44 w). The LED fluorescent lamp life for more than 10 times of ordinary lamp, almost maintenance free, often do not need to change the lamp, ballast, glow. Green environmental protection of semiconductor lighting, the light is downy, spectrum pure, is conducive to the user’s visual acuity protection and health. 6000 k in the cold light source, give a person the feeling of cool and refreshing on the vision, humanized design illumination differences, more help to concentrate, improve efficiency.
At present, the LED fluorescent lamp and common fluorescent lamp by comparison, advantages as follows:
1. Energy saving. 2. Long service life. 3. Good applicability, due to the volume of a single star LED is small, can be made into any shape. 4. The response time is short, is ns (ns) level of response time, while the common lamps and lanterns is ms (ms) level of response time. 5. Environmental protection, no harmful metals, waste recycling easily. 6. Colorful, light color is pure, narrow spectral range, and can pass the red, green, blue three primary colors mixed color into 7 colour or white light.
Disadvantages: 1. The price is expensive. 2. Now can do general theory of efficiency and light efficiency also has the very big disparity. 3. Now can do life and theory of life also has the very big disparity (10 w hours). 4. There is a certain calorific value. 5. Light failure need to shrink significantly.
But through technology improvement to overcome these shortcomings can be, so even if the LED street light source can not completely replace the traditional light source, but with the development of technology, must be LED the world in the future.
More info you can visit:http://www.lighting-ledlight.com
On both ends of the fluorescent lamp with a filament, inside the tubes filled with tiny amounts of argon and the thin mercury vapor, tube coated with fluorescent powder, on the wall between the two filament gas when conducting an ultraviolet, the fluorescent powder making soft visible light.
Characteristics of the fluorescent lamp, LED street light began to ignite need a high voltage, normal light allows only by small current, the voltage is lower than the voltage at the ends of the tube.
On both ends of the fluorescent tube is equipped with a filament, glass tube wall coated with a layer of thin fluorescent powder evenly and tube is pumped into the vacuum after the 10-3-10-4 mm hg, filled with a small amount of inert gas, also injected liquid water trace amounts of silver. Is a core inductance coil inductance ballast, the inductance of the nature is when the current in the coil change, will cause the change of the magnetic flux in coil, thus produce inductive electromotive force, the direction and the current in the opposite direction, thus hindering the current changes.
Electric fluorescent starter switch role in the circuit, it consists of a neon tube and a capacitance in parallel, and the role of the capacitor to eliminate the power supply of electromagnetic interference with ballast tank formation, and increase the voltage amplitude of the start pulse. An electrode in the discharge tube with double metal composition, using NaiPao discharge heating, make the bimetallic strip when open and close, cause the inductance ballast current mutation on both ends of the tube and generate high voltage pulse.
When the fluorescent lamp after access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, then the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role.
image4
2, LED fluorescent lamp:
LED fluorescent lamp with high quality, durable, energy saving as the main characteristics of the projection point of the adjusting range is big, the brightness of the 15 w is equivalent to ordinary 40 w fluorescent lamp. High temperature resistance, moistureproof and waterproof, prevent leakage. Using voltage: 110 v, 220 v optional, outer garment optional glass or PC material. Lamp holder and common fluorescent lamp.
LED fluorescent lamp adopts the latest LED light source technology, digital design, power saving more than 70%, the 12 w LED solar light intensity is equivalent to 40 w fluorescent tube (for the starter and ballast, 36 w fluorescent lamp real power consumption for 42 w to 44 w). The LED fluorescent lamp life for more than 10 times of ordinary lamp, almost maintenance free, often do not need to change the lamp, ballast, glow. Green environmental protection of semiconductor lighting, the light is downy, spectrum pure, is conducive to the user’s visual acuity protection and health. 6000 k in the cold light source, give a person the feeling of cool and refreshing on the vision, humanized design illumination differences, more help to concentrate, improve efficiency.
At present, the LED fluorescent lamp and common fluorescent lamp by comparison, advantages as follows:
1. Energy saving. 2. Long service life. 3. Good applicability, due to the volume of a single star LED is small, can be made into any shape. 4. The response time is short, is ns (ns) level of response time, while the common lamps and lanterns is ms (ms) level of response time. 5. Environmental protection, no harmful metals, waste recycling easily. 6. Colorful, light color is pure, narrow spectral range, and can pass the red, green, blue three primary colors mixed color into 7 colour or white light.
Disadvantages: 1. The price is expensive. 2. Now can do general theory of efficiency and light efficiency also has the very big disparity. 3. Now can do life and theory of life also has the very big disparity (10 w hours). 4. There is a certain calorific value. 5. Light failure need to shrink significantly.
But through technology improvement to overcome these shortcomings can be, so even if the LED street light source can not completely replace the traditional light source, but with the development of technology, must be LED the world in the future.
More info you can visit:http://www.lighting-ledlight.com
Wednesday, September 25, 2013
led street lighting made in China: The Specifications of LED Street light 160W made i...
led street lighting made in China: The Specifications of LED Street light 160W made i...: The Specifications of LED Street light 160W: Power (W) : 160 watt Dimension: 700*346*120mm ...
led street lighting made in China: The Specifications of LED Street light 160W made i...
led street lighting made in China: The Specifications of LED Street light 160W made i...: The Specifications of LED Street light 160W: Power (W) : 160 watt Dimension: 700*346*120mm ...
The Specifications of LED Street light 160W made in China
The Specifications of LED Street light 160W:
Power (W) : 160 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: The Specifications of LED Street light 120W made i...
led street lighting made in China: The Specifications of LED Street light 120W made i...: The Specifications of LED Street light 120W: Power (W) : 120 watt Dimension: 700*346*120mm ...
The Specifications of LED Street light 120W made in China
The Specifications of LED Street light 120W:
Power (W) : 120 watt
Dimension: 700*346*120mm
Inpute voltage(V): 85~265V AC
Ra (CRI) : ≥75
Color temp.(CCT): 2800-7500K
Power factor : ≥0.95
Power factor : ≥0.95
Frequency (Hz) : 47 to 63Hz
Light decay: ＜3% within 3000Hrs
Lifespan(Hrs) : ≥35,000H
Humidity range: 5 to 95％ R.H.
Work temp. -20～+55℃
Store temp.: -40～+85℃
Ip grade： IP65
Warranty: 3 years
Certification: CE FCC RoHS
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
Principle basic knowledge classification of the LED lighting chip
A history of 50 years ago, LED the people have to understand semiconductor materials can produce light of the basic knowledge, in 1962, general electric (ge), g He Lun ark (NickHolonyakJr.) developed the first practical application of visible light emitting diode. Leds are English light emitting diode (LED), its basic structure is an electroluminescent semiconductor materials, placed in a wire rack, then sealed with epoxy resin around, namely solid encapsulation, so can protect the internal core line, so the LED’s seismic performance is good. Initially LED street light is used as the indicator light instrument and then all kinds of light color of LED in the traffic signal lights and display screen has been widely applied in large area, produced good economic and social benefits. 12-inch red traffic lights, for example, in the United States could have been used long life and low light efficiency of 140 – watt incandescent lamp as light source, it produces 2000 lumens of white light. After the red filter, light loss 90%, only 200 lumens of red light. And in the light of the new design, Lumileds companies adopted 18 red LED light source, including circuit loss, total power consumption of 14 watts, can produce the same light. Car light is also an important field of LED light source.
Second, the principle of the LED chip, LED (LightEmittingDiode), light emitting diode, is a solid-state semiconductor devices, it can be directly put DianZhuan into light. The heart of the LED is a semiconductor chip, chip attached on a bracket, at the end of the end is negative, the other end connected to the power of the anode, the whole chip is encapsulated by epoxy resin. Semiconductor chip consists of two parts, one part is a p-type semiconductor, dominated by holes in it, the other end is n-type semiconductor, mainly electricity here. But this two kinds of semiconductor connected, between them to form a p-n junction. When a current flows through a wire to the chip, the electron will be pushed P area, electron and holes in the P zone compound, then will be issued in the form of photon energy, this is the principle of LED. And the wavelength of light was the color of the light, is determined by the formation of p-n junction material.
Three, the classification of the LED chip:
Definition: 1 MB chip definition and characteristics of MetalBonding (metal adhesive) chip; The chip of UEC patent products. Features: (1) using high coefficient of heat transfer materials – Si as substrate, the heat easily. ThermalConductivity GaAs: 46 w/m – K GaP: Si – 77 w/m K: 125 ~ 150 w/m – K Cupper: SiC: 300 ~ 400 w/m – K – 490 w/m K (2) joint by metal layer (waferbonding) of epitaxial layer and the substrate, reflect photons at the same time, avoid the absorption of substrate. (3) conducting the Si substrate instead of GaAs substrate, good heat conduction ability (3 ~ 4 times of thermal conductivity), more should be in the field of high drive current. (4) at the bottom of the metal reflector, benefits to the raise of luminosity and heat dissipation. (5) size can be increased, applied in the field of Highpower, eg: 42 milmb.
Definition and characteristics of definition: 2 GB chip GlueBonding (stick) chips; The chip of UEC patent products. Features: (1) transparent sapphire substrate instead of absorbance of GaAs substrate, the optical power is traditional AS (Absorbable structure) chip for more than 2 times of the sapphire substrate similar TS GaP substrate of the chip. (2) chip light all around, have excellent Pattern. (3) the brightness, its brightness over TS of the chip level (8.6 mil). (4) double electrode structure, its resistance to high current slightly worse than the TS single electrode chip.
3. The definition and characteristics of definition: TS chip transparentstructure (transparent substrate) chip, the chip belong to HP’s patent product. Features: (1) chip production process is complex, far higher than ASLED. (2) the reliability of excellence. (3) transparent substrate of the GaP, and do not absorb light, high brightness. (4) is used widely.
4. Definition and the characteristics AS chip definition: Absorbablestructure (substrate) chips; After nearly 40 years of development efforts, Taiwan LED light electricity industry for this type of chip research and development, production, sales in the mature stage, companies in the aspects of basic research and development level in the same level, the gap is not big. Chinese chip manufacturing industry started relatively late, its brightness and reliability with Taiwan, there is still a gap between the industry, we are talking about here AS chips, especially the UEC AS chips, eg: 712 sol – VR, 709 sol – VR, 712 sym – VR, 709 sym – VR, etc. Features: (1) four yuan chip, using the MOVPE process preparation, brightness relative to the conventional chips light. (2) good reliability. (3) is used widely.
Four, light emitting diode chip type of epitaxial material 1. The LPE: LiquidPhaseEpitaxy (liquid phase epitaxial method) GaP/GaP 2. VPE: VaporPhaseEpitaxy (gas phase epitaxial method) GaAsP/GaAs 3. MOVPE: MetalOrganicVaporPhaseEpitaxy organic metal vapor phase epitaxy (method) AlGaInP, GaN 4. SH: GaAlAs/GaAsSingleHeterostructure GaAs/GaAlAs (single heterotypic structure)
Second, the principle of the LED chip, LED (LightEmittingDiode), light emitting diode, is a solid-state semiconductor devices, it can be directly put DianZhuan into light. The heart of the LED is a semiconductor chip, chip attached on a bracket, at the end of the end is negative, the other end connected to the power of the anode, the whole chip is encapsulated by epoxy resin. Semiconductor chip consists of two parts, one part is a p-type semiconductor, dominated by holes in it, the other end is n-type semiconductor, mainly electricity here. But this two kinds of semiconductor connected, between them to form a p-n junction. When a current flows through a wire to the chip, the electron will be pushed P area, electron and holes in the P zone compound, then will be issued in the form of photon energy, this is the principle of LED. And the wavelength of light was the color of the light, is determined by the formation of p-n junction material.
Three, the classification of the LED chip:
Definition: 1 MB chip definition and characteristics of MetalBonding (metal adhesive) chip; The chip of UEC patent products. Features: (1) using high coefficient of heat transfer materials – Si as substrate, the heat easily. ThermalConductivity GaAs: 46 w/m – K GaP: Si – 77 w/m K: 125 ~ 150 w/m – K Cupper: SiC: 300 ~ 400 w/m – K – 490 w/m K (2) joint by metal layer (waferbonding) of epitaxial layer and the substrate, reflect photons at the same time, avoid the absorption of substrate. (3) conducting the Si substrate instead of GaAs substrate, good heat conduction ability (3 ~ 4 times of thermal conductivity), more should be in the field of high drive current. (4) at the bottom of the metal reflector, benefits to the raise of luminosity and heat dissipation. (5) size can be increased, applied in the field of Highpower, eg: 42 milmb.
Definition and characteristics of definition: 2 GB chip GlueBonding (stick) chips; The chip of UEC patent products. Features: (1) transparent sapphire substrate instead of absorbance of GaAs substrate, the optical power is traditional AS (Absorbable structure) chip for more than 2 times of the sapphire substrate similar TS GaP substrate of the chip. (2) chip light all around, have excellent Pattern. (3) the brightness, its brightness over TS of the chip level (8.6 mil). (4) double electrode structure, its resistance to high current slightly worse than the TS single electrode chip.
3. The definition and characteristics of definition: TS chip transparentstructure (transparent substrate) chip, the chip belong to HP’s patent product. Features: (1) chip production process is complex, far higher than ASLED. (2) the reliability of excellence. (3) transparent substrate of the GaP, and do not absorb light, high brightness. (4) is used widely.
4. Definition and the characteristics AS chip definition: Absorbablestructure (substrate) chips; After nearly 40 years of development efforts, Taiwan LED light electricity industry for this type of chip research and development, production, sales in the mature stage, companies in the aspects of basic research and development level in the same level, the gap is not big. Chinese chip manufacturing industry started relatively late, its brightness and reliability with Taiwan, there is still a gap between the industry, we are talking about here AS chips, especially the UEC AS chips, eg: 712 sol – VR, 709 sol – VR, 712 sym – VR, 709 sym – VR, etc. Features: (1) four yuan chip, using the MOVPE process preparation, brightness relative to the conventional chips light. (2) good reliability. (3) is used widely.
Four, light emitting diode chip type of epitaxial material 1. The LPE: LiquidPhaseEpitaxy (liquid phase epitaxial method) GaP/GaP 2. VPE: VaporPhaseEpitaxy (gas phase epitaxial method) GaAsP/GaAs 3. MOVPE: MetalOrganicVaporPhaseEpitaxy organic metal vapor phase epitaxy (method) AlGaInP, GaN 4. SH: GaAlAs/GaAsSingleHeterostructure GaAs/GaAlAs (single heterotypic structure)
Five, LED chips emitting LED chips and is composed of: main arsenic (AS) aluminum (AL) gallium (Ga) Indium (IN) of phosphorus (P) nitrogen (N), strontium (Si) in which several of several elements components.
LED chip Category:
1, according to brightness points: A, normal brightness: R, H, G, Y, E, etc. B, high brightness: VG, VY, SR, etc. C, high brightness: UG, UY, UR, UYS, URF, UE such as D, invisible (infrared): R, SIR, VIR, HIR E, infrared receiver tube: PT F, photocell: PD
2, according to elemental composition: A, two yuan wafer (phosphorus, gallium): H, G, etc. B, three yuan wafer (phosphorus, gallium, arsenic): SR, HR, UR, etc. C, four yuan wafer (phosphorus, aluminum , gallium, indium): SRF, HRF, URF, VY, HY, UY, UYS, UE, HE, UG
3.LED Chip Characteristics Table: LED street light Chip Model luminous colors of Element Wavelength (nm) SBI Blue lnGaN/sic430HY bright yellow AlGalnP595 SBK bright blue lnGaN/sic468SE bright orange GaAsP/GaP610 DBK lighter blue GaunN / Gan470HE bright orange AlGalnP620 SGL green lnGaN/sic502UE brightest orange AlGalnP620 DGL bright green LnGaN/GaN505URF brightest red AlGalnP630 DGM bright green lnGaN523E orange GaAsP/GaP635 PG pure Green GaP555R red GAaAsP655 SG standard green GaP560SR bright red GaA/AS660 G green GaP565HR GaAlAs660 VG bright red lighter green GaP565UR brightest red GaAlAs660 UG brightest green AIGalnP574H high red GaP697 Y yellow GaAsP/GaP585HIR infrared GaAlAs850 VY bright yellow GaAsP/GaP585SIR infrared GaAlAs880 UYS brightest yellow AlGalnP587VIR infrared GaAlAs940 UY brightest yellow AlGalnP595IR infrared GaAs940.
LED chip Category:
1, according to brightness points: A, normal brightness: R, H, G, Y, E, etc. B, high brightness: VG, VY, SR, etc. C, high brightness: UG, UY, UR, UYS, URF, UE such as D, invisible (infrared): R, SIR, VIR, HIR E, infrared receiver tube: PT F, photocell: PD
2, according to elemental composition: A, two yuan wafer (phosphorus, gallium): H, G, etc. B, three yuan wafer (phosphorus, gallium, arsenic): SR, HR, UR, etc. C, four yuan wafer (phosphorus, aluminum , gallium, indium): SRF, HRF, URF, VY, HY, UY, UYS, UE, HE, UG
3.LED Chip Characteristics Table: LED street light Chip Model luminous colors of Element Wavelength (nm) SBI Blue lnGaN/sic430HY bright yellow AlGalnP595 SBK bright blue lnGaN/sic468SE bright orange GaAsP/GaP610 DBK lighter blue GaunN / Gan470HE bright orange AlGalnP620 SGL green lnGaN/sic502UE brightest orange AlGalnP620 DGL bright green LnGaN/GaN505URF brightest red AlGalnP630 DGM bright green lnGaN523E orange GaAsP/GaP635 PG pure Green GaP555R red GAaAsP655 SG standard green GaP560SR bright red GaA/AS660 G green GaP565HR GaAlAs660 VG bright red lighter green GaP565UR brightest red GaAlAs660 UG brightest green AIGalnP574H high red GaP697 Y yellow GaAsP/GaP585HIR infrared GaAlAs850 VY bright yellow GaAsP/GaP585SIR infrared GaAlAs880 UYS brightest yellow AlGalnP587VIR infrared GaAlAs940 UY brightest yellow AlGalnP595IR infrared GaAs940.
Source from:http://www.lighting-ledlight.com/
led street lighting made in China: Resolving the influence about LED street lighting ...
led street lighting made in China: Resolving the influence about LED street lighting ...: LED (Light-EmittingDiode, acronym LED) is a light-emitting diode is short, the second half of 2009 , LED market big leap as high-growth eme...
Resolving the influence about LED street lighting with the development of Microscope strategic emerging industry
LED (Light-EmittingDiode, acronym LED) is a light-emitting diode is short, the second half of 2009 , LED market big leap as high-growth emerging industries, is expected by 2015 , LED street lighting industry will exceed 500 billion yuan , of which general lighting industry 160 billion yuan , a large -size LCD TV backlight industry 120 billion yuan , 20 billion yuan automotive lighting industry , general lighting industry 160 billion yuan , landscape , display and other industry 100 billion yuan .
LED industry chain can be divided into three parts, which are upstream of the growth substrate , wafer manufacturing, midstream and downstream chip packaging applications . In the whole industry chain, the core part of the growth substrate and epitaxial wafer manufacturing sectors , both technical content is relatively high, nearly 70% of total industry output value and profits .
LED current industry trends , the international and domestic markets, “National Semiconductor Lighting Project” under the impetus of China’s LED industry initially formed upstream of the substrate material , including LED , LED epitaxial wafers , led chip preparation , LED chips, packaging and application of LED products , including a relatively complete industrial chain .
Known semiconductor light-emitting diodes with high conversion efficiency , long life and other advantages, is considered to be the next generation of light sources and will replace the currently used conventional light sources . However, the performance of light-emitting diodes on the current point of view, to achieve this goal , there are many technical difficulties to be overcome , you need to analyze the material characterization , device analysis technology, and increase research efforts. In the light emitting diode device and the chip package structure of the structure , components, and the interface state analytical techniques optical microscopy, scanning electron microscopy , X-ray spectroscopy , secondary ion mass spectrometry equipment and structure of a device failure analysis, epitaxial process monitoring , improve and enhance the essential analysis tools.
The following briefly describes Zeiss optical microscopy, scanning electron microscopy in the LED production process part of the application .
I. Zeiss optical microscope , scanning electron microscope in the LED substrate material in the upstream ( sapphire material ) specific applications :
A sapphire substrate material introduced
Since sapphire insulation, dielectric loss, high temperature, corrosion . Good thermal conductivity, the mechanical strength is high enough . And can be processed into a flat surface . Transmission band width . It is widely used in industry, national defense , scientific research fields. But also a wide range of uses light-emitting diodes on a good substrate material . In the resulting light-emitting diode is the most promising to become high-brightness light-emitting diodes race sapphire substrate in the next generation of fluorescent light sources are semiconductor light emitting device substrate material . At present these high- brightness light-emitting diodes have been widely used in advertising , traffic lights, instrument lights ; and surgical lights and other fields. With high-brightness light-emitting diode applications increasingly widespread.
LED sapphire (Sapphire) is a single crystal alumina , also known as corundum . Sapphire crystal has excellent optical properties, mechanical properties and chemical stability , high strength, hardness, resistance to erosion, close to 2000 ℃ high temperature in harsh conditions. According to the study suggest that the current can be applied to the LED substrate material only four . As an important technique sapphire crystal , has been in the LED industry to form a more mature fashion and applications .
2, the application
Polarizing microscope using Zeiss exception can be identified sapphire crystal birefringence . In certain cases, by means of the cone of light microscopy, the crystal can be observed interferogram , determine the crystal axis , used in the direction of observation of each wafer is uniform , in order to determine the quality of the substrate .
Second, the Zeiss microscope, scanning electron microscope in the LED epitaxial wafers , LED chips preparation of the application process
1, LED epitaxial wafers Introduction
LED epitaxial film grown basic principle is: on a substrate heated to a suitable temperature the substrate ( mainly sapphires and , Sic, Si) , the gaseous substance in a controlled InGaAlP delivered to the substrate surface , growing single crystal thin film of a specific . LED epitaxial film growth techniques currently used mainly metal organic chemical vapor deposition (MOCVD)
2, LED chip introduced
LED chip, also known as LED light chip is the core component of led lights , but also refers to the PN junction . Its main functions are: electrical energy into light energy , the main material for silicon chips . Semiconductor chip consists of two parts, part of the P -type semiconductor , the hole in it dominates the other side is an N-type semiconductor, here is mainly electronic . But the two semiconductor connected , when between them to form a PN junction . When the current through the wire on the chip when the electron will be pushed to the P region , in the P zone electron hole recombination , and then will be issued in the form of photon energy , which is the principle of LED light . Is the wavelength of the light color of the light , is formed by the PN junction to the materials .
3 , Application:
a) the use of scanning electron microscopy wafer growth after dislocation planes corrosion morphology information ;
Crystal plane dislocations provide corrosion morphology meaning : respective samples of dislocation etch presents an different shapes and crystal and crystal structure of point group is determined , the role of chemical etchant is to destroy the molecules within the crystal , and interatomic bond , the first key to a smaller force is destroyed , thus forming the shape of a particular corrosion spots, so good imaging , has corrosion spots detail perfect presentation, can fully reflect the quality of the crystal growth form .
Improve the quality and reduce the epitaxial material lattice defects is to produce high performance and high reliability LED devices premise , or by other means is irreparable . Clear crystal quality of the LED epitaxial material Reliability of the device , through the epitaxial material quality control , to reduce the defect density materials to improve the crystal quality of the epitaxial layer and improve the reliability of the LED devices .
b) before packaging of the chip testing: surface inspection using an optical microscope to determine if there is mechanical damage and pitting, the chip size and the size of the electrode meets the process requirements , the electrode pattern is complete.
c) LED chip oxide thickness: Detection technologies include color comparison, the edge count , interference, ellipsometry , sculptured needle amplitude and scanning electron microscopy ;
d) Measurement of the chip wafer junction depth : SEM PN junction of the LED chip wafer thickness detection junction depth
e) SEM etching process of the LED street lighting chip surface roughening process research applications: surface roughening techniques to solve because the refractive index of the semiconductor material ( average 3.5 ) is greater than the refractive index of air leaving the angle of incidence greater than the critical angle of total reflection of light can not be the losses caused by the exit . Roughening the surface of the light emitted great randomness requires a lot of experiments to study the roughness scale roughening rate of the light . An LED light from the high refractive index material GaP window layer air enters the low refractive index , the total reflection is generated , and significant loss of the emitted light . Surface roughening method using the total reflection can be suppressed to improve light extraction efficiency. Scanning electron microscope to directly observe the roughened structure of the sample surface , compared to rough surface roughness before and after treatment . SEM large depth of field , rich three-dimensional image can be observed through the roughened surface of three-dimensional island structure .
Third, the Zeiss optical microscopy and scanning electron microscopy analysis of the LED device failure in the finished application .
Scanning electron microscopy and X-ray energy spectrum analyzer can overload caused by thermal power LED stratification and black failure analysis. The results show that , since the light emitting diode of the input current increases , the chip junction temperature rise caused by thermal overload epoxy lens chip and the mismatch between the thermal stress , coupled with expansion of the epoxy material to moisture stress , eventually lead to light-emitting diode chip surface with the epoxy resin at the interface delamination . An epoxy resin in contact with the chip surface material under the action of high temperature aging, after degradation significantly change the internal structure of the epoxy resin , to form a C elemental and oxide deposited on the chip surface, which is the main surface of the chip black reasons .
Source from:http://www.lighting-ledlight.com/
led street lighting made in China: The nine factors for the large gap of the price be...
led street lighting made in China: The nine factors for the large gap of the price be...: The ceaseless development of lighting industry, LED lamps and lanterns and traditional lamps and lanterns of competition. The LED street li...
The nine factors for the large gap of the price between the different LED lights
The ceaseless development of lighting industry, LED lamps and lanterns and traditional lamps and lanterns of competition. The LED street lights are acted the role of a large number of manufacturers, different vendors use different quality of LED is the important cause of LED lamps and lanterns is different. Because of the price competition is increasingly fierce, appearance, structure, function almost the same products, price difference is 2 to 3 times, many users get faint head, I don’t know spreads to come from, is generally not in the production of LED tube LED lighting plants are difficult to separate, and consumers.
So, choose oneself have good LED production source, or a perfect LED testing equipment would be a good LED lighting factory, bought the LED lighting products will be more secure. Let’s see what are the factors of the LED lamps and lanterns price difference:
1, brightness
LED brightness is different, the price is different.
2, antistatic ability
Antistatic ability of LED, long life and therefore price is high. Antistatic usually greater than 700 v LED can be used in the LED lighting.
3, wavelength,
LED, wavelength consistent? Color is consistent, such as required? Color is consistent, the price is high. Not the manufacturer of the LED light color separation instrument is not easy to produce pure color products.
4, the leakage current
LED is a one-way conductive lights, if there is a reverse current, is called the leakage, leakage current big LED, short service life, low price.
5, light Angle
Use different LED light Angle is different. Special light Angle, the price is higher. Such as the diffuse Angle, the price is higher.
6, different life
Quality is the key to life, life is decided by droop. Droop small, long service life, long life, high price.
7, the LED chip
LED lights for chip, different chips, the price difference is very big. Japan, the United States of the chip is more expensive, factory with local manufacturers of the LED chip price is lower than the day, the United States.
8, and the size of the chip,
The size of the chip to side, said big LED chip quality is better than that of the small chip. The price is proportional with the chip size.
9, colloid
Ordinary LED colloid generally for epoxy resin, leds with uv radiation and fire retardant added more expensive, high quality outdoor LED street lights should be uv and fire prevention.
LED lighting market is part of the illegal ACTS, cheat supplier, diddle supplier material production of finished products, sold at abnormally low finished product for cash. There are a few LED lighting manufacturers to unrealistic promises on dealers and users, and then use changing, head of the firm or tricks to shirk responsibility, therefore, when consumer is buying must pay attention to these details.
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
So, choose oneself have good LED production source, or a perfect LED testing equipment would be a good LED lighting factory, bought the LED lighting products will be more secure. Let’s see what are the factors of the LED lamps and lanterns price difference:
1, brightness
LED brightness is different, the price is different.
2, antistatic ability
Antistatic ability of LED, long life and therefore price is high. Antistatic usually greater than 700 v LED can be used in the LED lighting.
3, wavelength,
LED, wavelength consistent? Color is consistent, such as required? Color is consistent, the price is high. Not the manufacturer of the LED light color separation instrument is not easy to produce pure color products.
4, the leakage current
LED is a one-way conductive lights, if there is a reverse current, is called the leakage, leakage current big LED, short service life, low price.
5, light Angle
Use different LED light Angle is different. Special light Angle, the price is higher. Such as the diffuse Angle, the price is higher.
6, different life
Quality is the key to life, life is decided by droop. Droop small, long service life, long life, high price.
7, the LED chip
LED lights for chip, different chips, the price difference is very big. Japan, the United States of the chip is more expensive, factory with local manufacturers of the LED chip price is lower than the day, the United States.
8, and the size of the chip,
The size of the chip to side, said big LED chip quality is better than that of the small chip. The price is proportional with the chip size.
9, colloid
Ordinary LED colloid generally for epoxy resin, leds with uv radiation and fire retardant added more expensive, high quality outdoor LED street lights should be uv and fire prevention.
LED lighting market is part of the illegal ACTS, cheat supplier, diddle supplier material production of finished products, sold at abnormally low finished product for cash. There are a few LED lighting manufacturers to unrealistic promises on dealers and users, and then use changing, head of the firm or tricks to shirk responsibility, therefore, when consumer is buying must pay attention to these details.
More info you can visit:http://www.lead-lighting.com/products/bid31-1.htm
led street lighting made in China: The main performance index of LED street light
led street lighting made in China: The main performance index of LED street light: LED key performance indicators LED performance indicators are a core part of the whole , only by understanding its performance indicators i...
The main performance index of LED street light
LED key performance indicators
LED performance indicators are a core part of the whole , only by understanding its performance indicators in order to understand the depth of the LED street lighting, for future product development and sales can also be handy, but also take into the LED industry must understand something , let me now come to we carried out a detailed analysis in :
(1) LED colors : LED color is a very important indicator , is related to each LED lighting products to be labeled , the current LED colors are red, green , blue , cyan , yellow, white , warm white , amber and other colors, designs and orders in our time this parameter is that it must not be forgotten ( especially beginners ) because the colors are different, the relevant parameters have changed a lot.
(2) LED current : LED ‘s forward limit (IF) in the current multi- 20MA, and the LED light failure current is not greater than the IF / 3, about 15MA and 18MA .. LED luminous intensity only within a certain range of the IF into proportional , when the iF> 20MA , the brightness enhancement has been unable to use the inner eye points out , so the LED current general election in the 17-19MA so reasonable. previously for ordinary low-power LED (0.04-0.08W) between the LED, but except for some Piranha LED ( some around in 40MA ratings ) in addition to the continuous development of technology , high power LED are also emerging as 0.5W LED (IF = 150MA), 1W LED (IF = 350MA), 3W LED (IF = 750MA) there are other more specifications, I will not be introduced , and you can check it yourself LED manual .
(3) LED voltage : we usually refer to the forward voltage of the LED , that LED anode connected to the positive power supply , negative to negative power . Voltage relationship with color , red, yellow, green voltage is 1.8 – between 2.4v . White, blue , green voltage is between 3.0-3.6v , the same number of LED ‘s voltage may be some differences , according to the manufacturer’s prevail in the outside temperature , VF will fall.
(4) LED reverse voltage VRm: the maximum allowed plus reverse voltage. Exceeds this value, light emitting diodes may be damaged breakdown
(5) LED color temperature : K to indicate the absolute temperature , about a standard blackbody heating, the temperature rises to a certain extent, starting from the dark red color – light red – orange – white – blue , gradual change , a light source and a blackbody the same color , we called the absolute temperature of the blackbody at the color temperature of the light source .
In fact due to the correlated color temperature of the light source is a light color close to blackbody radiation , the performance of the light source color evaluation value , not a precise color contrast , the color temperature value with the same second light source , the light -colored appearance may still some differences . Only Feng color temperature light source can not understand the color capability of the object , or an object under the light source to reproduce the colors . Different correlated color temperature of lighting conditions .
LED performance indicators are a core part of the whole , only by understanding its performance indicators in order to understand the depth of the LED street lighting, for future product development and sales can also be handy, but also take into the LED industry must understand something , let me now come to we carried out a detailed analysis in :
(1) LED colors : LED color is a very important indicator , is related to each LED lighting products to be labeled , the current LED colors are red, green , blue , cyan , yellow, white , warm white , amber and other colors, designs and orders in our time this parameter is that it must not be forgotten ( especially beginners ) because the colors are different, the relevant parameters have changed a lot.
(2) LED current : LED ‘s forward limit (IF) in the current multi- 20MA, and the LED light failure current is not greater than the IF / 3, about 15MA and 18MA .. LED luminous intensity only within a certain range of the IF into proportional , when the iF> 20MA , the brightness enhancement has been unable to use the inner eye points out , so the LED current general election in the 17-19MA so reasonable. previously for ordinary low-power LED (0.04-0.08W) between the LED, but except for some Piranha LED ( some around in 40MA ratings ) in addition to the continuous development of technology , high power LED are also emerging as 0.5W LED (IF = 150MA), 1W LED (IF = 350MA), 3W LED (IF = 750MA) there are other more specifications, I will not be introduced , and you can check it yourself LED manual .
(3) LED voltage : we usually refer to the forward voltage of the LED , that LED anode connected to the positive power supply , negative to negative power . Voltage relationship with color , red, yellow, green voltage is 1.8 – between 2.4v . White, blue , green voltage is between 3.0-3.6v , the same number of LED ‘s voltage may be some differences , according to the manufacturer’s prevail in the outside temperature , VF will fall.
(4) LED reverse voltage VRm: the maximum allowed plus reverse voltage. Exceeds this value, light emitting diodes may be damaged breakdown
(5) LED color temperature : K to indicate the absolute temperature , about a standard blackbody heating, the temperature rises to a certain extent, starting from the dark red color – light red – orange – white – blue , gradual change , a light source and a blackbody the same color , we called the absolute temperature of the blackbody at the color temperature of the light source .
In fact due to the correlated color temperature of the light source is a light color close to blackbody radiation , the performance of the light source color evaluation value , not a precise color contrast , the color temperature value with the same second light source , the light -colored appearance may still some differences . Only Feng color temperature light source can not understand the color capability of the object , or an object under the light source to reproduce the colors . Different correlated color temperature of lighting conditions .
Color temperature
8000-8500k northern skies
Overcast 6500-7500k
5500k midday summer sun
Metal halide lamp 4000-4600k
Afternoon sunlight 4000k
Cool Camp Light 4000-5000k
High-pressure mercury lamp 3450-3750k
Warm Camp Light 2500-3000k
Halogen 3000k
Tungsten 2700k
HPS 1950-2250k
Candle light 2000k
8000-8500k northern skies
Overcast 6500-7500k
5500k midday summer sun
Metal halide lamp 4000-4600k
Afternoon sunlight 4000k
Cool Camp Light 4000-5000k
High-pressure mercury lamp 3450-3750k
Warm Camp Light 2500-3000k
Halogen 3000k
Tungsten 2700k
HPS 1950-2250k
Candle light 2000k
Different color temperature light source , the light color is also different :
The light source color temperature of different light colors are different, there is less color temperature 3000k warm feeling , to sedate atmosphere ; color temperature 3000k-5000k color temperature for the middle , there is a refreshing feeling ; color temperature 5000k over a cold feeling. ( 6 ) : luminous intensity (I, Intensity): Unit Candela , that cd. The direction of the light source unit in a given solid angle is defined as the light flux emitted in this direction ( fat ) light intensity ( degree ) , luminous intensity point light source for the purposes of , or the size of the illumination light compared to the distance comparison small occasions . This quantity is to show light in the convergence space launch capability . It can be said , the luminous intensity of the light in the end is to describe how ” bright” , because it is capable of converging optical power and a common description . The greater the light intensity , the light source look brighter , while under the same conditions after the irradiation by the light source , the brighter the object is , therefore , described earlier flashlight are using this parameter . LED is now also used to describe this unit , such as an LED is 15000 , the unit is mcd, 1000mcd = 1cd, so 15000mcd is 15cd. The reason for LED milli cd (mcd) rather than directly to a cd that is because in the past the first LED is dark , such as 1984 ‘s standard 5mm LED the luminous intensity before 0.005cd, so only use mcd said, now very powerful LED , but still follow the original argument. Said luminous intensity with a “Brightness” The disadvantage is that if two identical die LED, moderate convergence is high luminous intensity . Therefore, buy LED when not blindly pursue high I value , but also the irradiation angle . Many high I value of the LED emission efficiency is not improved to achieve its own , but the irradiation angle of the lens extended narrowing to achieve, which although useful for the LED street lighting , but the viewing angle is limited. In addition , the same die LED, 5mm in diameter than 3mm in I value more than twice as large , but only 10mm diameter 1/ 4 because the larger the lens the better convergence characteristic .
(7) LED luminous flux (F, Flux): Unit lumens, ie lm. Light emitted in a unit time is called the amount of light Luminous source . Again, the amount of the light source , the light source is to describe the size of the total , equivalent to the optical power . Light flux is larger, more light emitted for the isotropic light ( i.e. the sources of light emitted in all directions with the same density ) , then F = 4πI. That is, if the light source I is 1cd, the total flux is 4π = 12.56 lm. Comparison with mechanical units , luminous flux equivalent pressure, and luminous intensity equivalent pressure . To appear brighter spot is irradiated , not only to improve the luminous flux, but also to increase the converging means , in fact, reduced area , so as to obtain greater strength . You know, the amount of flux is artificial , for other animals may not be the same, but not completely natural thing, because this definition is based entirely on the response of the human eye comes to light . Human eye to different colors of light feeling is different, and this feeling determines the luminous flux and optical power conversion relationship . Most sensitive to the human eye yellow green 555nm , 1W = 683 lm, that is , 1W convert all the power of the light wavelength of 555nm , is 683 lumens. This is the maximum light conversion efficiency , but also scaling value , because the human eye is most sensitive to light of 555nm . For other colors of light , such as red 650nm , 1W only about 73 lumens of light , this is because the human eye is not sensitive to red light causes. For white light , depending on the situation, because a lot of different spectral structure of the light is white . Such as LED white light, white light and sun on television on very different, different spectra .
Lumen White LED now commonly enumerated , for your reference : 0.06W → 3-5LM, 0.2W → 13-15LM, 1W → 60-80LM.
(8) LED illumination (E, Illuminance): Unit Lux namely lx ( formerly called lux). 1 Lumen uniformly distributed on the surface of one square meter of the illumination generated .
We usually use this parameter was not a lot, we are not here for a detailed description .
( 9 ) CRI:
Color rendering light on the object itself known the extent of color , that is, the degree of color fidelity ; light color rendering index is to show that it represents an object in a light color than the reference light ( sunlight ) lighting color deviation , can more fully reflect the color characteristics of the light source . High color rendering light source on the color performance is better, we have seen it close to the color of natural color, low color rendering light source color performance is poor, we have seen the color deviation is also larger . International Commission on Illumination CIE color rendering index of the sun set at 100 , all kinds of color rendering index varies , such as: high pressure sodium lamp CRI Ra = 23, fluorescent tube CRI Ra = 60 ~ 90. Chromogenic in two ways:
Faithful color : performance material can be properly need to use the original color rendering index (Ra) of high light , its value is close to 100 , the color is best .
Color effects : To clearly emphasize a particular color , showing the lives of U.S. law can be used to add color to enhance the color effect
( 10 ) Glare : Vision has an extremely bright object or strong brightness and contrast , you can cause visual discomfort known as glare, glare is an important factor affecting the quality of lighting .
(11) LED life :
LED in the general description, can all be used more than 50,000 hours , and some manufacturers claim that their LED can operate 100,000 hours. The main problem is in this regard , LED is not a simple operation is no longer just that it’s rated life of the lamp can not be measured by conventional methods to calculate . In fact, the test LED life, no one has been waiting for it to stay next stop functioning. However, there are other ways to measure the LED life. The reason why LED lasting, because it does not produce the problem of filament fuse . LED does not directly stop working , but it will over time gradually degraded . It is predicted that high-quality LED after 50,000 hours of continuous operation, but also to maintain the initial light intensity more than 60% . Assumption that LED has reached its rated life , in fact it may still be light, but the light is very weak Bale. To extend the service life of LED , it is necessary to reduce or completely dissipate the heat generated by the LED chip . Heat is the main reason for the LED stops functioning . Life of the LED and the LED chip and LED driver related , I will become the LED experts << secret by improving the application of article >> LED life for a detailed explanation .
(12) LED Beam Angle: LED light-emitting angle is, its light scattering angles , mainly by diode production plus scattering agent to control , there are three main categories: ( 1 ) high directivity . Generally pointed epoxy package , or package with a metal reflector cavity , and does not add scattering agent . Angle 5 ° ~ 20 ° or less , with a high directivity , can be used for local illumination light source or the light detector associated to form an automatic detection system. ( 2 ) standard . Typically used for light , the luminous angle of 20 ° ~ 45 °. ( 3 ) the scattering type . This is a large angle light -emitting angle is 45 ° ~ 90 ° or more, a large amount of scattering agent .
The light source color temperature of different light colors are different, there is less color temperature 3000k warm feeling , to sedate atmosphere ; color temperature 3000k-5000k color temperature for the middle , there is a refreshing feeling ; color temperature 5000k over a cold feeling. ( 6 ) : luminous intensity (I, Intensity): Unit Candela , that cd. The direction of the light source unit in a given solid angle is defined as the light flux emitted in this direction ( fat ) light intensity ( degree ) , luminous intensity point light source for the purposes of , or the size of the illumination light compared to the distance comparison small occasions . This quantity is to show light in the convergence space launch capability . It can be said , the luminous intensity of the light in the end is to describe how ” bright” , because it is capable of converging optical power and a common description . The greater the light intensity , the light source look brighter , while under the same conditions after the irradiation by the light source , the brighter the object is , therefore , described earlier flashlight are using this parameter . LED is now also used to describe this unit , such as an LED is 15000 , the unit is mcd, 1000mcd = 1cd, so 15000mcd is 15cd. The reason for LED milli cd (mcd) rather than directly to a cd that is because in the past the first LED is dark , such as 1984 ‘s standard 5mm LED the luminous intensity before 0.005cd, so only use mcd said, now very powerful LED , but still follow the original argument. Said luminous intensity with a “Brightness” The disadvantage is that if two identical die LED, moderate convergence is high luminous intensity . Therefore, buy LED when not blindly pursue high I value , but also the irradiation angle . Many high I value of the LED emission efficiency is not improved to achieve its own , but the irradiation angle of the lens extended narrowing to achieve, which although useful for the LED street lighting , but the viewing angle is limited. In addition , the same die LED, 5mm in diameter than 3mm in I value more than twice as large , but only 10mm diameter 1/ 4 because the larger the lens the better convergence characteristic .
(7) LED luminous flux (F, Flux): Unit lumens, ie lm. Light emitted in a unit time is called the amount of light Luminous source . Again, the amount of the light source , the light source is to describe the size of the total , equivalent to the optical power . Light flux is larger, more light emitted for the isotropic light ( i.e. the sources of light emitted in all directions with the same density ) , then F = 4πI. That is, if the light source I is 1cd, the total flux is 4π = 12.56 lm. Comparison with mechanical units , luminous flux equivalent pressure, and luminous intensity equivalent pressure . To appear brighter spot is irradiated , not only to improve the luminous flux, but also to increase the converging means , in fact, reduced area , so as to obtain greater strength . You know, the amount of flux is artificial , for other animals may not be the same, but not completely natural thing, because this definition is based entirely on the response of the human eye comes to light . Human eye to different colors of light feeling is different, and this feeling determines the luminous flux and optical power conversion relationship . Most sensitive to the human eye yellow green 555nm , 1W = 683 lm, that is , 1W convert all the power of the light wavelength of 555nm , is 683 lumens. This is the maximum light conversion efficiency , but also scaling value , because the human eye is most sensitive to light of 555nm . For other colors of light , such as red 650nm , 1W only about 73 lumens of light , this is because the human eye is not sensitive to red light causes. For white light , depending on the situation, because a lot of different spectral structure of the light is white . Such as LED white light, white light and sun on television on very different, different spectra .
Lumen White LED now commonly enumerated , for your reference : 0.06W → 3-5LM, 0.2W → 13-15LM, 1W → 60-80LM.
(8) LED illumination (E, Illuminance): Unit Lux namely lx ( formerly called lux). 1 Lumen uniformly distributed on the surface of one square meter of the illumination generated .
We usually use this parameter was not a lot, we are not here for a detailed description .
( 9 ) CRI:
Color rendering light on the object itself known the extent of color , that is, the degree of color fidelity ; light color rendering index is to show that it represents an object in a light color than the reference light ( sunlight ) lighting color deviation , can more fully reflect the color characteristics of the light source . High color rendering light source on the color performance is better, we have seen it close to the color of natural color, low color rendering light source color performance is poor, we have seen the color deviation is also larger . International Commission on Illumination CIE color rendering index of the sun set at 100 , all kinds of color rendering index varies , such as: high pressure sodium lamp CRI Ra = 23, fluorescent tube CRI Ra = 60 ~ 90. Chromogenic in two ways:
Faithful color : performance material can be properly need to use the original color rendering index (Ra) of high light , its value is close to 100 , the color is best .
Color effects : To clearly emphasize a particular color , showing the lives of U.S. law can be used to add color to enhance the color effect
( 10 ) Glare : Vision has an extremely bright object or strong brightness and contrast , you can cause visual discomfort known as glare, glare is an important factor affecting the quality of lighting .
(11) LED life :
LED in the general description, can all be used more than 50,000 hours , and some manufacturers claim that their LED can operate 100,000 hours. The main problem is in this regard , LED is not a simple operation is no longer just that it’s rated life of the lamp can not be measured by conventional methods to calculate . In fact, the test LED life, no one has been waiting for it to stay next stop functioning. However, there are other ways to measure the LED life. The reason why LED lasting, because it does not produce the problem of filament fuse . LED does not directly stop working , but it will over time gradually degraded . It is predicted that high-quality LED after 50,000 hours of continuous operation, but also to maintain the initial light intensity more than 60% . Assumption that LED has reached its rated life , in fact it may still be light, but the light is very weak Bale. To extend the service life of LED , it is necessary to reduce or completely dissipate the heat generated by the LED chip . Heat is the main reason for the LED stops functioning . Life of the LED and the LED chip and LED driver related , I will become the LED experts << secret by improving the application of article >> LED life for a detailed explanation .
(12) LED Beam Angle: LED light-emitting angle is, its light scattering angles , mainly by diode production plus scattering agent to control , there are three main categories: ( 1 ) high directivity . Generally pointed epoxy package , or package with a metal reflector cavity , and does not add scattering agent . Angle 5 ° ~ 20 ° or less , with a high directivity , can be used for local illumination light source or the light detector associated to form an automatic detection system. ( 2 ) standard . Typically used for light , the luminous angle of 20 ° ~ 45 °. ( 3 ) the scattering type . This is a large angle light -emitting angle is 45 ° ~ 90 ° or more, a large amount of scattering agent .
Source from:http://www.lighting-ledlight.com/
Subscribe to:
Posts (Atom)