Assessing the Performance of 5mm White LED Light Sources forDeveloping-Country Applications | Zendy

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Assessing the Performance of 5mm White LED Light Sources forDeveloping-Country Applications

Author(s) -

Evan Mills

Publication year - 2007

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/923294

Subject(s) - light emitting diode , white light , white paper , led lamp , environmental science , light source , focus (optics) , optics , computer science , telecommunications , process engineering , engineering , physics , geography , archaeology

Some white light-emitting diode (LED) light sources haverecently attained levels of efficiency and cost that allow them tocompete with fluorescent lighting for off-grid applications in thedeveloping world. Additional attributes (optics, size, ruggedness, andservice life) make them potentially superior products. Enormousreductions in energy use and greenhouse-gas emissions are thus possible,and system costs can be much lower given the ability to downsize thecharging and energy storage components compared to a fluorescentstrategy. However, there is a high risk of "market-spoiling" if inferiorproducts are introduced and result in user dissatisfaction. Completesystems involve the integration of light sources and optics, energysupply, and energy storage. A natural starting point for evaluatingproduct quality is to focus on the individual light sources. This reportdescribes testing results for batches of 10 5mm white LEDs from 26manufacturers. Efficacies and color properties are presented

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