Modeling the radiation pattern of LEDs.
Light-emitting diodes (LEDs) come in many varieties and with a wide range of radiation patterns. We propose a general, simple but accurate analytic representation for the radiation pattern of the light emitted from an LED. To accurately render both the angular intensity distribution and the irradiance spatial pattern, a simple phenomenological model takes into account the emitting surfaces (chip, chip array, or phosphor surface), and the light redirected by both the reflecting cup and the encapsulating lens. Mathematically, the pattern is described as the sum of a maximum of two or three Gaussian or cosine-power functions. The resulting equation is widely applicable for any kind of LED of practical interest. We accurately model a wide variety of radiation patterns from several world-class manufacturers.
Unidad Academica de Fisica, Universidad Autonoma de Zacatecas, Zacatecas 98060, Mexico. imoreno@planck.reduaz.mx
Ivan
I
Moreno
Ching-Cherng
CC
Sun
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*