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Proceedings Paper

Investigation of illumination efficiency on the LED therapy with different array types
Author(s): Hsi-Chao Chen; Cheng-Jyun Liou
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Paper Abstract

Light-emitting diodes (LEDs) are a major discovery in twenty-one century for its advantages including small size, long lifetime, low voltage, high response and good mechanical properties. It is an environment-friendly product and maybe becomes a lighting source in future. In the other way LED lighting also is used for the lighting source of cosmetology. LED phototherapy provided medicine with a new tool capable of delivering light deep into tissues of the body, at wavelengths that are biologically optimal for pain treatment and holistic healing. The illumination efficiency is one of the key indexes for the LED phototherapy. LEDs were arranged on a disk of diameter of 100mm with different array types: a radial, a rhombus, an octagon, and a square. Then the LEDs with view angle of 120 degree were used for the lighting sources. Trace-Pro software was used for the optical simulation. The array types of radial and square were better than those of rhombus and octagon for illumination efficiency. In the mixture efficiency of a radial array was observed by different distances from 1mm to 100mm. However lighting could reach the well mixture after the treatment distance of 30mm by optical simulation. The view angle could reach ±60 degree at the treatment distance of 50 mm for the LED phototherapy mockup.

Paper Details

Date Published: 18 August 2009
PDF: 8 pages
Proc. SPIE 7422, Ninth International Conference on Solid State Lighting, 742215 (18 August 2009); doi: 10.1117/12.825443
Show Author Affiliations
Hsi-Chao Chen, National Yunlin Univ. of Science and Technology (Taiwan)
Cheng-Jyun Liou, De Lin Institute of Technology (Taiwan)

Published in SPIE Proceedings Vol. 7422:
Ninth International Conference on Solid State Lighting
Ian T. Ferguson; Christoph Hoelen; Jianzhong Jiao; Tsunemasa Taguchi, Editor(s)

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