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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 6 — Mar. 15, 2010
  • pp: 6137–6148

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

Ching-Cherng Sun, Wei-Ting Chien, Ivan Moreno, Chih-To Hsieh, Mo-Cha Lin, Shu-Li Hsiao, and Xuan-Hao Lee  »View Author Affiliations


Optics Express, Vol. 18, Issue 6, pp. 6137-6148 (2010)
http://dx.doi.org/10.1364/OE.18.006137


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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.

© 2010 OSA

OCIS Codes
(080.2710) Geometric optics : Inhomogeneous optical media
(230.3670) Optical devices : Light-emitting diodes
(080.4295) Geometric optics : Nonimaging optical systems
(080.4298) Geometric optics : Nonimaging optics

History
Original Manuscript: December 24, 2009
Revised Manuscript: February 13, 2010
Manuscript Accepted: March 5, 2010
Published: March 11, 2010

Virtual Issues
Focus Issue: Solar Concentrators (2010) Optics Express

Citation
Ching-Cherng Sun, Wei-Ting Chien, Ivan Moreno, Chih-To Hsieh, Mo-Cha Lin, Shu-Li Hsiao, and Xuan-Hao Lee, "Calculating model of light transmission efficiency of diffusers attached to a lighting cavity," Opt. Express 18, 6137-6148 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-6-6137


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