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By iSmithers Rapra Publishing

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By iSmithers Rapra Publishing

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IES LM-79-2008, Approved Method for the Electrical and Photometric Testing of Solid-State Lighting Devices, enables the calculation of LED luminaire efficacy (net light output from the luminaire divided by the input power and measured in lumens per watt). Luminaire efficacy is the most reliable way to measure LED product performance, measuring luminaire performance as a whole instead of relying on traditional methods that separate lamp ratings and fixture efficiency. LM-79 helps establish a foundation for accurate comparisons of luminaire performance, not only for SSL, but for all sources.

Gateway Demonstrations DOE GATEWAY demonstrations showcase high-performance LED products for general illumination in a variety of commercial and residential applications. Demonstration results provide real-world experience and data on state-of-the-art solid-state lighting (SSL) product performance and cost effectiveness. These results connect DOE technology procurement efforts with large-volume purchasers and provide buyers with reliable data on product performance. DOE shares the results40 of completed GATEWAY demonstration projects, publishing detailed reports and briefs on completed projects.

COM plastic electronics > e-book > OLEDs vs LEDs LED Infrastructure and Supply Chains light intensity. The major disadvantages are that energy is lost in converting photons from low wavelengths to higher ones, and that dynamic color control is not possible. Phosphors The development of white LEDs was facilitated by the development by Nichia of an efficient blue GaN-based emitter with a peak at about 465 nm, coupled with a broadband yellow Ce3+:YAG phosphor emitting light over the range 500–700 nm (FWHM of ~100nm)68.

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