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Proceedings Paper

Simple function for intensity distribution from LEDs
Author(s): Ivan Moreno; Chang-Yu Tsai; David Bermúdez; Ching-Cherng Sun
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Paper Abstract

Since its beginnings, light-emitting diode (LED) has progressed toward greater performance. Today, LEDs are everywhere, in many shapes, and with a wide range of radiation patterns. We propose a general analytic representation for the angular intensity distribution of the light emitted from an LED. The radiation pattern equation is determined by adding a Gaussian or a power cosine expression for contributions from the emitting surfaces (chip, chip arrays, or for some cases a phosphor surface), and the light redirected by the reflecting cup and the encapsulating lens. Mathematically, the pattern is described as a sum of Gaussian or of cosine-power functions. The resulting equation is widely applicable for any kind of LED of practical interest. We successfully model the radiation patterns from several manufacturer datasheets.

Paper Details

Date Published: 18 September 2007
PDF: 7 pages
Proc. SPIE 6670, Nonimaging Optics and Efficient Illumination Systems IV, 66700H (18 September 2007); doi: 10.1117/12.735820
Show Author Affiliations
Ivan Moreno, Univ. Autonoma de Zacatecas (Mexico)
National Central Univ. (Taiwan)
Chang-Yu Tsai, National Central Univ. (Taiwan)
David Bermúdez, Univ. Autonoma de Zacatecas (Mexico)
Ching-Cherng Sun, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6670:
Nonimaging Optics and Efficient Illumination Systems IV
Roland Winston; R. John Koshel, Editor(s)

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