An LED panel lamp is presented for general indoor illumination. This lamp consists of arrayed LED light sources with each LED united with an evening lens so that the Lambertian distribution of LED light is altered, and the illuminance on a target plane can be uniform. The computer simulation result shows that the illuminance uniformity is 0.737, and the maximum illuminance is 140 lx on a detecting screen at 1.5 m away.
LED panel lamp Evening lens Uniform illumination
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The authors would like to thank the National Science Council in Taiwan for financially supporting this research under Grant No. NSC 101-2221-E-018-026.
Zhen ZR, Hao X, Liu X (2009) Freeform surface lens for LED uniform illumination. Appl Opt 48:6627–6634CrossRefGoogle Scholar
Chen J-J, Cheng K-H (2010) Light-emitting cover lens design for large-scale liquid crystal device television backlight modules. Opt Eng 49:053003CrossRefGoogle Scholar
West RS, Takaaki Y (2003) High brightness direct LED backlight for LCD TV. SID, pp 1262–1265Google Scholar
Zhang Y (2011) Indoor illumination based on distributive LED lights. In: Proceedings of the ICCTA, 2011Google Scholar