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Proceedings Paper

Modeling of non-Lambertian sources in lighting applications
Author(s): Mark Bennahmias; Engin Arik; Kevin Yu; Dmitry Voloshenko; Kangbin Chua; Ranjit Pradhan; Thomas Forrester; Tomasz Jannson
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Paper 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.

Paper Details

Date Published: 14 September 2007
PDF: 6 pages
Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66691A (14 September 2007); doi: 10.1117/12.732654
Show Author Affiliations
Mark Bennahmias, Physical Optics Corp. (United States)
Engin Arik, Luminit (United States)
Kevin Yu, Luminit (United States)
Dmitry Voloshenko, Luminit (United States)
Kangbin Chua, Physical Optics Corp. (United States)
Ranjit Pradhan, Physical Optics Corp. (United States)
Thomas Forrester, Physical Optics Corp. (United States)
Tomasz Jannson, Physical Optics Corp. (United States)

Published in SPIE Proceedings Vol. 6669:
Seventh International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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