LED-based lighting for general illumination was first introduced about 20 years ago. As LEDs became more and more prevalent, concerns began to develop about the magnitude of lumen and chromaticity ...
The Illuminating Engineering Society of North America (IES) recently introduced a new document, TM-21-11, "Projecting Long Term Lumen Maintenance of LED Light Sources The Illuminating Engineering ...
Manufacturers are learning much about the best way of reporting and demonstrating LED luminaire lifetimes. There has been a lot of discussion about the issue of measuring the lifetime of solid-state ...
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