Simple function for intensity distribution from LEDs

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

doi:10.1117/12.735820

18 September 2007 Simple function for intensity distribution from LEDs

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

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.

Citation Download Citation

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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