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14 September 2007 Modeling of non-Lambertian sources in lighting applications
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The photometric modeling of LEDs as generalized Lambertian sources (GL-Sources) is discussed. Non-Lambertian LED sources, with axial symmetry, have important real-world applications in general lighting. In particular, so-called generalized Lambertian sources, following a cosine to the nth power distribution (n≥1), can be used to describe the luminous output profiles from solid-state lighting devices like LEDs. For such sources, the knowledge of total power (in Lumens [Lms]), the knowledge of the output angular characteristics, as well as source area, is sufficient information to determine all other critical photometric quantities such as: maximum radiant intensity (in Candelas [Cd = Lm/Sr]) and maximum luminance (in nits [nts = Cd/m2]), as well as illuminance (in lux [lx = Lm/m2]). In this paper, we analyze this approach to modeling LEDs in terms of its applicability to real sources.
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Mark Bennahmias, Engin Arik, Kevin Yu, Dmitry Voloshenko, Kangbin Chua, Ranjit Pradhan, Thomas Forrester, and Tomasz Jannson "Modeling of non-Lambertian sources in lighting applications", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66691A (14 September 2007);

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