Modeling of non-Lambertian sources in lighting applications

Mark Bennahmias; Engin Arik; Kevin Yu; Dmitry Voloshenko; Kangbin Chua; Ranjit Pradhan; Thomas Forrester; Tomasz Jannson

doi:10.1117/12.732654

14 September 2007 Modeling of non-Lambertian sources in lighting applications

Mark Bennahmias, Engin Arik, Kevin Yu, Dmitry Voloshenko, Kangbin Chua, Ranjit Pradhan, Thomas Forrester, Tomasz Jannson

Author Affiliations +

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 66691A (2007) https://doi.org/10.1117/12.732654
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.732654

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