seven principles of Buying LED lamps

1, the chip radiated power level difference:
Xiamen Sanan chip, for example, S-23BBMUP-C *******, chip size is 23X10mil, this core has four radiation power levels (@ 20mA), the higher the radiation power, making the led street light wholesale beads brighter.
D24 and D27 radiated power difference 8mW, ie, the same size chip, lamp beads made of different brightness, a lot of difference, you need to know the chip radiation power levels.
2, lamp beads scaffold difference:
There are currently on the market, aluminum frame, brass frame, copper, such as stents, the cheapest aluminum frame, copper bracket expensive, the price difference of ten times. Even the copper bracket, silver prices also have high and low points, the market is generally called a good stand, mostly made of silver-plated brass.
3, the chip size difference:
The chip size is typically reported is mil, if not high power measuring microscope, is generally difficult to distinguish, the brighter the greater the chip, we can compare the size of the chip area by calculating the chip, such as 23X10, the chip area is 230 square mil, is a good way to use the chip area of the chip size difference.
4, wire material differences:
Chip and bracket is complete with gold wire bonding method in electrical communication with the wire on the market today, two gold wire, gold wire is best, according to the thickness of the gold is divided 0.7,0.9,1.0,1.2 etc., the more gold thick, lower heat set, the longer the life, to ask what all the material and diameter gold wire.
5, the phosphor difference:
White light beads with blue chip plus ** phosphor made, the main points aluminate and silicate phosphors, aluminate outperforms silicate, aluminate is the most representative of YAG, YAG stable performance , low light decay, poor silicate their chemical stability, but the brightness is higher than the YAG, want a stable performance of the products, but do not be fooled so-called high-brightness, this is a big problem.
6. Glue the difference:
Phosphor is to glue and after stirring at the point on the chip, the glue is good or bad influence to the light fades and color drift, poor glue for a long time will be yellow, light is increased, the glue is jelly.
7, color separation, partial pressure and spectral specifications:
Separation: is the color temperature binned as 3200K-3350K is a file, regular packaging factory will provide the color temperature of BIN code, the smaller the better color temperature binning, color temperature binning small light source color to make good consistency .
Partial pressure: that chip voltage binning, such as 3.0V-3.15V, the light source is a series-parallel connection, the voltage binning control in less than 0.15V, uniform current distribution of such sources, will help improve the life of the light source.
Splitting: that led street lighting fixture beads brightness binning, sub-file or have lumens of light intensity binning used for lighting, preferably lumens bins. Recommend purchase LED, or in luminous efficiency based, high-efficiency products, energy saving, long life before.
These are a few principles purchase LED lamp beads, only by understanding the content, and do these terms in your contract orders, you will have the opportunity to protect their interests, otherwise, you must suffer, lamp beads price is the most seductive trap, sink once, the company has only closed leave.