Improvement of illumination uniformity for LED flat panel light by using micro-secondary lens array

Hsiao Wen Lee, Bor-Shyh Lin

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

LED flat panel light is an innovative lighting product in recent years. However, current flat panel light products still contain some drawbacks, such as narrow lighting areas and hot spots. In this study, a micro-secondary lens array technique was proposed and applied for the design of the light guide surface to improve the illumination uniformity. By using the micro-secondary lens array, the candela distribution of the LED flat panel light can be adjusted to similar to batwing distribution to improve the illumination uniformity. The experimental results show that the enhancement of the floor illumination uniformity is about 61%, and that of the wall illumination uniformity is about 20.5%.

Original languageEnglish
Pages (from-to)A788-A798
JournalOptics Express
Volume20
Issue number106
DOIs
StatePublished - 5 Nov 2012

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