Calculating model of light transmission efficiency of diffusers attached to a lighting cavity | Zendy

Ching-Cherng Sun | Zendy; Wei-Ting Chien | Zendy; Iván Moreno | Zendy; Chih-To Hsieh | Zendy; Mo-Cha Lin | Zendy; Shu-Li Hsiao | Zendy; Xuan-Hao Lee | Zendy

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Calculating model of light transmission efficiency of diffusers attached to a lighting cavity

Author(s) -

Ching-Cherng Sun,

Wei-Ting Chien,

Iván Moreno,

Chih-To Hsieh,

Mo-Cha Lin,

Shu-Li Hsiao,

Xuan-Hao Lee

Publication year - 2010

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.18.006137

Subject(s) - diffuser (optics) , optics , light emitting diode , light scattering , scattering , materials science , transmission (telecommunications) , led lamp , integrating sphere , diode , optoelectronics , ray , white light , physics , light source , computer science , telecommunications

A lighting cavity is a reflecting box with light sources inside. Its exit side is covered with a diffuser plate to mix and distribute light, which addresses a key issue of luminaires, display backlights, and other illumination systems. We derive a simple but precise formula for the optical efficiency of diffuser plates attached to a light cavity. We overcome the complexity of the scattering theory and the difficulty of the multiple calculations involved, by carrying out the calculation with a single ray of light that statistically represents all the scattered rays. We constructed and tested several optical cavities using light-emitting diodes, bulk-scattering diffusers, white scatter sheets, and silver coatings. All measurements are in good agreement with predictions from our optical model.

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