title: Calculating model of light transmission efficiency of diffusers attached to a lighting cavity.
abstract: 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.
authors.affiliation: Department of Optics and Photonics, National Central University, Chung-Li 320, Taiwan. ccsun@dop.ncu.edu.tw
authors.forename: Ching-Cherng
authors.initials: CC
authors.lastname: Sun
authors.forename: Wei-Ting
authors.initials: WT
authors.lastname: Chien
authors.forename: Ivan
authors.initials: I
authors.lastname: Moreno
authors.forename: Chih-To
authors.initials: CT
authors.lastname: Hsieh
authors.forename: Mo-Cha
authors.initials: MC
authors.lastname: Lin
authors.forename: Shu-Li
authors.initials: SL
authors.lastname: Hsiao
authors.forename: Xuan-Hao
authors.initials: XH
authors.lastname: Lee
mesh_terms: 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*