LRC publishes ASSIST recommendation on lamp dimming look and feel

The new publication recommends acceptable characteristics in minimum and maximum dimming levels and dead travel, but does not suggest a profile of light intensity changes relative to dimmer setting.

The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has released a new publication in the ASSIST (Alliance for Solid-State Illumination Systems and Technologies) series that recommends how lamps should dim regardless of type of light source. The recommendations are based on research into industry standards, experiments that gauge use expectations and preferences, and lab tests of lamps and dimming controls.

The. "ASSIST recommends ... Dimming: A technology-neutral definition" publication is available on the LRC website The study was prompted by the fact that dimmable LED and compact fluorescent (CFL) lamps often perform differently from legacy sources, but is meant to apply to all types of light sources.

The LRC worked on the project for two years with the normal ASSIST goal of removing barriers that might impede the adoption of led outdoor lighting wholesale. "The LRC and ASSIST's industry members are interested in understanding the technical problems impeding market acceptance of LED lighting, and dimming is one focus area, "said Nadarajah Narendran, the director of research at the LRC and organizer of the ASSIST program." By understanding the compatibility issues and what users want when they dim their lights, we can improve not only the dimming experience but also the likelihood that homeowners will permanently switch to energy-efficient LED lighting. "

Results summary

The results of the research are quite simple. For now lamps should be dimmable down to at least 5% of the full lamp output, and that number should be reduced with maturation of LED dimming technology. Lamps should produce at least 90% of full output (relative to light produced when not connected to a dimmer) at the maximum dimmer setting.

The LRC also addresses dead travel on a dimmer when there is no response by the lamps at the top or bottom of the scale, and recommends a maximum of 10% at either the low or high ends. Flicker is also addressed, albeit through a reference to a prior ASSIST recommendation on flicker from 2012. The new publication requires an acceptability rating greater than zero based on the methodology described previously.

The new publication mentions but does not define either dimming profile or audible noise associated with dimmed led indoor lighting wholesale. The document acknowledges the importance of minimum audible noise relative to consumer acceptance but also said there are simply no available criteria or measurement methodologies to apply to the problem at present.

The publication also doesn't address profile - which is the relative change of light level based on the dimmer setting The report does say that people generally prefer a profile based on a square law curve (documented in prior LRC research) that matches the logarithmic. . response of the human visual system The document does specify monotonic operation, meaning that the lamp should never respond in an opposite manner from a change of a dimmer setting - it should never increase in brightness when the dimmer is adjusted down or vice versa.

ASSIST is an alliance that dates to 2002 between the LRC, researchers, manufacturers, and government agencies. The mission remains helping the lighting industry transition to energy-efficient lighting.

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Everlight announces 1W white LED, adds to IR and HIR LED families

The XI3535 LED in a low-cost plastic package targets general-illumination SSL applications, while Everlight also announces new IR products for remote controls and touch screens.

Everlight Electronics has announced the XI3535 1W white LED Panel light 18w omni-directional retrofit lamps, directional lighting, and other residential solid-state lighting (SSL) products. The 940-nm IR26-71C/61C LEDs target remote control applications and the 850-nm HIR83, HIR89, and HIR91 LEDs target proximity-sensing applications such as touch screens.
The new white LEDs are available across a CCT range from 2700K to 6500K. Everlight offers CRI greater than 80 for the entire family. The top-view LEDs have a 115 ° beam pattern.

Flux output is 105-100 lm for cool and warm white LEDs, respectively, at 350 mA of drive current. The efficacy ranges from 109-115 lm / W. The single-emitter LEDs have a nominal forward voltage of 3V. Everlight also offers two-emitter packages that operate from 6V and 150 mA of drive current.
IR and HIR LEDs
The infrared (IR) LED Panel light 36w include the HIR83, HIR89, and HIR91 that Everlight refers to as high-efficiency infrared (HIR), and the lower-power IR26-71C/61C, and in both bands you have the option of top-or side-view models.
Offering a viewing angle of 30 °, the top-view HIR89-01C produces 55 mW / sr of power at 70 mA of drive current. The top-view HIR91-01C/L297 delivers 40 mW / sr at 70 mA, and a beam angle of 40 °. For side-view applications, the HIR83-01B offers an asymmetric pattern 100 ° × 40 ° for applications such as touch screens and outputs 5 mW / sr at 20 mA.
The side-view IR26-71C and top-view IR26-61C are low profile LEDs that measure 1.2-mm high. The former has a 50 ° beam angle, and the latter a 20 ° beam angle. The LEDs output 8 mW / sr at 20 MA.

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LED manufacturing research: RPI integrates features, studies address cost and efficiency

New RPI research proves the concept of integrating led street light fixture on the same chip with other electronic components such as transistors, while other new research focuses on maximizing the light extraction efficiency of LEDs and lowering cost through simpler materials.

Researchers at the Rensselaer Polytechnic Institute (RPI) Smart Lighting Engineering Research Center (ERC) have integrated a power transistor in gallium-nitride (GaN) layers along with an LED structure. An RPI doctoral student has also published research on a novel method that could improve the light extraction efficiency of LEDs. Researchers at the University of Washington hope to reduce the cost of slid-state lighting (SSL) products via a transition from phosphors based on rare-earth elements to electroluminescent silicon particles derived from sand.
Integrating circuit elements
The RPI research is focused on adding functionality to LED chips that can simplify the increasingly complex external electronics required to drive the LED. The laboratory project involved the monolithic integration of both a high-electron-mobility transistor (HEMT) and an LED on one chip . This simple first step of integration could provide a real benefit, eliminating the external MOSFET power transistor typically used to switch an LED on and off.

When asked whether the laboratory research would bring real value to the SSL space, T. Paul Chow, an engineering professor at RPI and the leader of the recent research, said, "Eliminating the MOSFET is the first step. We can add the gate driver circuitry, and then more integration to realize a power converter. "Chow also said a single HEMT could control multiple LEDs on one chip.
The project utilized a GaN substrate and realized an LED that matches the light density of standard GaN LEDs being manufactured in volume today. So presumably there is no performance impact of integrating more functionality.
The research team has big dreams and compares the development with the evolution of transistors to dense ICs in the silicon semiconductor world. In fact, Chow calls the new type of device a light-emitting integrated circuit (LEIC).
"This new study, and the device we have created, is just the tip of the iceberg," said Smart Lighting ERC director Robert Karlicek, a co-author of the study and RPI professor. "LEICs will result in even higher energy efficiency of . LED lighting systems But what will be even more exciting are the new devices, new applications, and new breakthroughs enabled by LEICs -. they will truly usher in the era of smart lighting "
The implication is LEDs that might have complex integrated functions ranging from sensors to perhaps communication capabilities or even low-end microprocessors. Chow added, "We can also integrate some sensors, and eventually a network. However, how much one will do in GaN and how much in silicon nanometer-scaled CMOS is subject to discussions, system or IC partition choices, and sometimes debate. "
Silicon ICs are so much lower in cost relative to circuit real estate that GaN-based functions will likely remain focused on power-conversion circuitry and sensors. The study entitled "Monolithic integration of light-emitting diodes and power metal-oxide semiconductor channel high- electron-mobility transistors for light-emitting power integrated circuits in GaN on sapphire substrate "has been published in the scientific journal Applied Physics Letters.
Increasing extraction efficiency
Separately, an RPI student is behind an approach to increase the brightness of GaN LEDs by minimizing the photons that are trapped within the device. Notice of the research entitled "Graded-refractive-index (GRIN) structure for brighter and smarter light-emitting diodes "came to light back in February when RPI announced that doctoral student Ming Ma was a finalist for the Lemelson-Rensselaer Student Prize. Subsequently, Ma was announced as the winner of the $ 30,000 award and has now published the research on the International Society for Optics and Photonics website.
The research focuses on the fact that the broad difference in refractive index between GaN and air results in total internal reflection of light and extraction efficiency below 30%. The paper describes micro-pillars constructed of dielectric layers on top of the led street light fixture Manufacturer surface that layer -by-layer provide a gradual transition in refractive index. The study revealed light extraction as high as 70%.
Silicon nanoparticles
A startup called LumiSands, meanwhile, has emerged from the Center for Commercialization at the University of Washington in Seattle that hopes to replace rare-earth phosphors with silicon nanoparticles - both lowering the cost of LEDs and SSL products and improving the light spectrum.

Hopefully, manufacturers could substitute traditional rare-earth elements with our material with minimal additional steps, "said Ji Hoo, a doctoral student in electrical engineering and co-founder of LumiSands." It will be cheaper, better-quality lighting for users. " The researchers noted that rare-earth elements are expensive, dangerous to mine, and largely controlled by China.
The team has thus far demonstrated the conversion of blue LED light into red light using silicon particles that are smaller than 5 nm. They believe that they can develop yellow and green particles in short order. The combination of the three and blue LED emitters could deliver a spectrum near that of sunlight.

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Honeywell launches LED Lighting Solutions business unit to serve North America

The new SSL business unit will target commercial customers in North America and serve a complementary role to Honeywell's building controls and automation products.

Honeywell has announced that its newly-formed led street lights price Solutions business unit will launch a line of energy-efficient solid-state lighting (SSL) products to the North American commercial market. The potential for offering energy-saving lighting led to the new business unit with Honeywell planning to bolster the baseline efficiency of LEDs with its broad line of building-control and-automation products that can support adaptive lighting control scenarios.

"LED lights are greener, have a lower total cost of ownership, and last longer," said Beth Wozniak, president of Honeywell Environmental and Combustion Controls "But what really unlocks their value is adding Honeywell's unparalleled expertise in integrating building management systems -. Lighting , lighting controls, heating-ventilation-air-conditioning - to make buildings smarter and give building owners more control over their total energy consumption and costs ".

Initially, Honeywell will offer the linear LED-tube-based products pictured, primarily for commercial and industrial applications. The portfolio includes Strip, Surface Wrap, and Vapor Tight products. The company said the design delivers better beam control than competing LED tubes with the ability to offer a ± 30 ° adjustment in beam angle. The products rely on external drivers integrated in the fixtures.

In justifying its initial commercial and industrial targets, the company said that lighting represents 26% of energy usage in commercial applications, and 11% in industrial applications, and that those two segments make up 72% of the overall energy consumption in North America.

The initial products target lighting applications including stairwells, parking garages, manufacturing floors, cold storage facilities, and warehouses. Later in 2013, the company plans to add retrofit tube lamps, planar ceiling fixtures, and high-bay luminaires. Honeywell said that it will also roll out a new line of lighting controls including sensors and switches that can be integrated with other Honeywell building controls.

"Our new led street lighting Manufacturer Solutions business broadens Honeywell's energy efficiency portfolio and offers a strong retrofit opportunity with building owners looking to maximize efficiency and operational savings," said Wozniak. "No one understands buildings and energy better than Honeywell."

Honeywell has offered LED lighting in other regions of the globe for some time including Europe and Asia Pacific. For example, the company said that more than 80 Walmart stores in China have been retrofitted with Honeywell LED lighting.

More info you can visit:http://www.lighting-ledlight.com/index.php/category/led-street-light/

Cree and Ewo deliver LED high-mast lighting at Munich Airport

High-mast outdoor lighting applications are one area-lighting technology in which LEDs have struggled to find success with fixtures mounted at 100 ft or higher. Ewo, however, has installed its LED-based F32 floodlights in such an application on the apron of the Munich Airport (FMG) after first trialing solid-state lighting (SSL) technology at the airport two years ago.
The airport installation turned to led street light wholesale to both slash energy costs and to provide better quality lighting. The prior high-pressure sodium (HPS) lights rendered colors poorly, as is common with all HPS lights. Low CRI isn't an issue in many outdoor applications, but the airport wanted lights that could boost safety.
"Assuring the safety of our passengers, planes and their crew, airport staff, and any other visitor is a priority at Munich Airport," said Günther Sellmeier, planning and project manager for exterior lighting and engineering and facilities at FMG. Ewo didn't reveal the actual CRI of the lights, but the Cree XT-E LEDs used in the fixtures have a minimum CRI of 70 and are offered at higher CRIs. HPS lights have a typical CRI in the range of 25. The higher CRI makes it far easier for equipment operators to see workers and other obstacles.
The airport projects a minimum of 50% energy savings with the new lights. That will equate to an annual reduction of 122,000 kWh and a reduction of 70 tons of carbon emissions.
The project chronology shows how LEDs are evolving and how long some SSL projects take to come to fruition. We first reported on the story in February 2012 when Ewo tested LED lights on two of the high-mast poles. Initially the lights delivered 46% energy savings. The final installation used newer led street light supplier, and delivered better performance.
Slowly LEDs are catching on in high-mast applications. Last June we covered a freeway project in Maine in which Acuity supplied Holophane HMAO luminaires. At the time the Maine Department of Transportation said that the cost and weight of LED products had hampered the use of SSL in the application. Earlier, Cooper Lighting announced a high-mast project in Idaho.
Still, there are lighting professionals who think other light-source technologies may be most suitable for high-mast lighting. In an article on the 2012 Street and Area Lighting Conference over on our Illumination in Focus website, we covered a project at the Port of Oakland, California where Luxim LEP (light-emitting plasma) sources were determined the best match for a major retrofit of HPS fixtures.

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Cree supplies LED street lights to scenic Arctic town

Als we denken aan een nieuwe straatverlichting project , we zelden nadenken over de noodzaak voor grote verlichting zodat mensen een ijsbeer zou glimp of rendieren in de buurt. Maar dat is het geval in Svalbard , Noorwegen, waar weinig, maar een middernachtzon is zichtbaar in vele gebieden tussen april en augustus . In de stad Svalbard 's van Longyearbyen , de recente vervanging van 450 HPS straatverlichting met Cree LEDway armaturen in staat stelt naar schatting 70 % energiebesparing en een snelle terugverdientijd .
1 . LED commercial lighting wholesale verlichten de straten van Longyearbyen voor alle bewoners te voldoen.
LED's verlichten de straten van Longyearbyen voor alle bewoners te voldoen.
Spitsbergen is een eilandengroep , gelegen ongeveer halverwege tussen Noorwegen en de Noordpool . Het Longyearbyen project is misschien wel net zo gemotiveerd door energiebesparing als de wens om lichtvervuiling te verminderen en het behoud van de natuurlijke habitat van de wilde dieren . De installatie , afgewerkt in oktober van vorig jaar , toegespitst op gerichte straatverlichting tijdens langdurige , donkere uren .
De LEDway armaturen zijn geschikt voor meer dan 10.000 uur lichtopbrengst maar een geprojecteerde lumenbehoud van 50.000 uur ( 4,7 jaar als bediende 24 uur / dag ) . Wordt het Noorwegen installatie zal naar verwachting normale levensduur gedrag overschrijden , omdat LED commercial lighting Manufacturer presteren het beste in koude temperaturen . de armaturen worden aangeboden in kleurtemperaturen van 4000K of 5700K met een minimale CRI van 70 .
De gemiddelde energiebesparing in Longyearbyen wordt geschat op 70 % ten opzichte van HPS lampen. De NanoOptic technologie, die lichtvervuiling vermindert door zich in het licht met behulp van totale interne reflectie ( TIR ) optica, dateert uit de eerste LEDway ontwerpen.

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Recycled-material LED desk lamps installed in Seattle hotel

LittleFootprint Lighting , een maker van LED- werkplekverlichting gevestigd in Santa Cruz , Californië , kondigde de installatie van zijn HeronLED persoonlijke taak lichten in 120 kamers in Seattle Hotel 1000 .
De HeronLED lamp is gemaakt van gerecycled elektronisch afval in de VS.

De HeronLED Personal Task Light is een made-in -USA LED Panel light 18w die Energy Star-certificering heeft verdiend en is vervaardigd van gerecyclede computers en andere elektronische afval . " Klanten laat het ons weten we nodig hadden om de verlichting te verbeteren , en we geloven dat onze gasten zullen waarderen dat we het hebben gedaan met een bureaulamp dat bespaart niet alleen energie , maar vermindert ook het storten en wordt gemaakt in de VS ", aldus Denny Fitzpatrick , general manager van Hotel 1000 .
Gerelateerd artikel : ADATA Verlichting releases Tulip LED bureaulamp met 1000 - lx verlichting
"Verbetering van de geloofsbrieven duurzaamheid en het verminderen van de energiekosten zijn zeer belangrijke doelstellingen in de gehele horeca , " zei Nancy Wahl - Scheurich , LED Panel light 36w van LittleFootprint Lighting . "We zijn ook bewust , echter dat hotels niet zal investeren in een licht gewoon omdat het 'groen' ; . het moet er goed uitzien en zorgen echt goed licht Een van de belangrijkste redenen Hotel 1000 koos de HeronLED was om te reageren op gasten suggesties die verlichting van het bureau worden verbeterd helderheid de HeronLED en eenvoudige aanpassing aan het licht komen waar . de gebruiker het wil de klus te klaren . "

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