Project Lighting - April 2008 - (Page 19)

FeAtURe in the industry are starting to realize, there is a need for intelligence, in the form of digital control, to economically and efficiently overcome the big retrofit challenges, and achieve the gains that this new technology can offer. somE intErEsting EfficiEncy numbErs FIg 1 a SimPle “White light” leD SyStem alloWS ProDuction color caliBration. to 15 lm/W, while a fluorescent lamp manages 70 to 100 lm/W, an HID lamp 80 to 120 lm/W, current volume-production LEDs 80 lm/W, and LEDs in the laboratory 131 lm/W (Cree, November 2006). The LED’s theoretical maximum is 200 lm/W (DOE SSL R&D estimates). whitE is not a coLor Contents Viewpoint Selecting HBLED Drivers for Lighting Apps Simulation Technique for Optimizing White-LED Design An Analytical Approach to Cooling HBLEDs Lighting News Energy Star (http://www. energystar.gov) estimates that if efficient lighting were used in all locations in the U.S. where it has been shown to be profitable, the nation’s total demand for electricity would be cut by more than 10%. This could save nearly $17 billion in ratepayer bills and provide yearly pollution reductions of 202 million metric tons of carbon dioxide, the equivalent of taking 15 million cars off the road. Efficient office building lighting upgrades can save 48% of a building’s lighting energy use. An incandescent lamp yields 10 One of the biggest advantages of LED technology is its ability to produce light over a very narrow frequency range— resulting in pure colors, high efficiency, and no radiated heat. This is fine if color is what we are looking for, but in general lighting applications we are really looking for white. In other words, we need a wide mix of colors in a balance designed to mimic the spectrum of the sunlight, after it is filtered by the earth’s atmosphere. White light can be obtained from an LED source by applying a phosphorous material Home Page Product Training Module Online Ordering Suppliers Catalog FIg 2 a Smart leD Solution can uSe a microcontroller anD a conStant-current DriVer. 19 | Project lighting | aPr 08 http://www.energystar.gov http://www.energystar.gov http://digikey.com/ http://ad.doubleclick.net/clk;198717884;26055153;t http://ad.doubleclick.net/clk;198717989;26055167;e http://ad.doubleclick.net/clk;198717988;26055168;e http://ad.doubleclick.net/clk;198717986;26055170;v http://ad.doubleclick.net/clk;198717985;26055171;v

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Project Lighting - April 2008 Contents Viewpoint About Project Lighting Sponsor Simulation Technique for Optimizing White-LED Design An Analytical Approach to Cooling HBLEDs LED Lighting Needs Smarts to be Competitive Lighting News Enter to Win an iPhone Refernce Materials Lighting Quick Links

Project Lighting - April 2008

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