Calculating model of light transmission efficiency of diffusers attached to a lighting cavity.
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.
Sun
Ching-Cherng
CC
Department of Optics and Photonics, National Central University, Chung-Li 320, Taiwan. ccsun@dop.ncu.edu.tw
Chien
Wei-Ting
WT
Moreno
Ivan
I
Hsieh
Chih-To
CT
Lin
Mo-Cha
MC
Hsiao
Shu-Li
SL
Lee
Xuan-Hao
XH
D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*