Simple function for intensity distribution from LEDs

Ivan Moreno; Chang-Yu Tsai; David Bermúdez; Ching-Cherng Sun

doi:10.1117/12.735820

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18 September 2007 Simple function for intensity distribution from LEDs

Ivan Moreno, Chang-Yu Tsai, David Bermúdez, Ching-Cherng Sun

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Proceedings Volume 6670, Nonimaging Optics and Efficient Illumination Systems IV; 66700H (2007) https://doi.org/10.1117/12.735820
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

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Ivan Moreno, Chang-Yu Tsai, David Bermúdez, and Ching-Cherng Sun "Simple function for intensity distribution from LEDs", Proc. SPIE 6670, Nonimaging Optics and Efficient Illumination Systems IV, 66700H (18 September 2007); https://doi.org/10.1117/12.735820

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