Translator Disclaimer
21 September 2011 Optical transmittance of high-efficiency cavity with photon recycling
Author Affiliations +
A planar-exit lighting surface is not only used in the luminaires but also useful in the display backlights and other illumination systems. Most planar-exit lighting surfaces are made by edge-lit with line light source or 1-D LED array. If it is not edge-lit type, the light source can be two-dimensional, but a cavity is required. In this paper, a high-efficiency cavity providing extremely high energy transmittance with photon recycling is reported and demonstrated. The cavity contains a diffuser and the high reflectivity surfaces. The optical efficiency of the cavity is calculated by a formula with considering photon recycling. Furthermore, various kinds of diffusers are applied to change the optical transmittance as well as the light pattern. When the reflectivity of the inner wall of the lighting cavity is about 96 %, the optical efficiency of the cavity is higher than 90 % with several diffusers. The experimental measurement as well as the calculation is demonstrated in the paper.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Che-Chu Lin, Xuan-Hao Lee, Wei-Ting Chien, Hen-Xiang Chen, and Ching-Cherng Sun "Optical transmittance of high-efficiency cavity with photon recycling", Proc. SPIE 8128, Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII, 812805 (21 September 2011);


Design of collimating system for LED source
Proceedings of SPIE (December 31 2013)
High-performance LED luminaire for sports hall
Proceedings of SPIE (September 03 2015)
A microstructure diffuser plate for LED lighting
Proceedings of SPIE (September 26 2007)
Non-axisymmetrical freeform design for short LED street lamp
Proceedings of SPIE (September 22 2011)

Back to Top