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Proceedings Paper

LED light recycling using double prisms
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Paper Abstract

A novel LED recycling scheme using double prisms is presented. Two identical triangular prisms with square bases, one cross-stacked on top of the other, are tight-fit into a mirrored light tunnel. The whole prism/light tunnel assembly is then mounted on top of a square LED source, whose emitting area is the same as that of the base plane of the said prism/light tunnel assembly. Each prism acts as a tapered-down light guide in one dimension, which selectively retro-reflects high angle light along that direction. The outer light tunnel serves as a mirrored wall that folds back any light that escapes outside the two prisms. For a given collection cone angle, the height of the two prisms is optimized using ASAP, a commercial ray-tracing software. Simulation and experimental results show promise in significantly increasing the brightness of the LED sources within the collection cone. Specifically for a 4x recycling ratio a 70% recycling gain in center illuminance has been achieved (i.e., illuminance measured in the forward direction). This scheme has advantages over previous recycling configurations due to its compactness and ease of mounting. For example, compared to Wavien's spherical reflector approach that has been previously published, the current recycling configuration is much smaller in size because instead of fitting a much larger mirrored reflector on top of the LED source, this time we're using a structure that has the same lateral dimensions as those of the LED source itself. Further improvement is also possible if optimization of various system parameters is carried out.

Paper Details

Date Published: 30 September 2013
PDF: 6 pages
Proc. SPIE 8835, LED-based Illumination Systems, 88350E (30 September 2013); doi: 10.1117/12.2021978
Show Author Affiliations
George Ouyang, Wavien, Inc. (United States)
Kenneth Li, Wavien, Inc. (United States)

Published in SPIE Proceedings Vol. 8835:
LED-based Illumination Systems
Jianzhong Jiao, Editor(s)

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