Hollow Light Guide for Light Weight and High Efficiency Planar Illuminator

Abstract

Light guides have been widely used for transforming line or point sources into planar illuminators for general lighting applications. A hollow light guide with a diffusive reflection cavity (DRC) associated with edge-light LED light sources has been proposed to resolve the issues of weight, uniformity and efficiency simultaneously. The experiment shows an overall efficiency of 84.35%, uniformity of 90.5%, at the height of 35cm, the illumination is 1396 lux that only needed 3 watts of total LED driving power. The weight of the whole module is 180g, 55% lighter than the solid light guide with the same size.