18 December 2012 Design and manufacturing of LED primary optics for road lighting engine
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Abstract
GaN-based blue LEDs with various types of phosphor has been providing high brightness in lighting application with the integration of various nonimaging optical parts for controlling luminous intensity distribution. Such secondary optics, particularly in road lighting, inherently lose light flux of 15% with additional manufacturing and assembling cost. Making primary optics of LED as functional as secondary optics will cut off this additional cost and further increase the efficacy of luminaire. In this paper, we present the design procedure of LED primary optics as functional as road lighting secondary optics. The compact freeform lens has been designed with precise optical modeling of the target LED. Machining of primary optics mold comprise a determinant solution in generating specific luminous intensity distribution for road lighting. Optical performance of the primary optics had advantages of much smaller size in volume (~1/10), lumen efficacy (~93.9%).
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jae Young Joo, Wan Ho Kim, Soon Sub Park, Sang Bin Song, "Design and manufacturing of LED primary optics for road lighting engine", Proc. SPIE 8550, Optical Systems Design 2012, 85502O (18 December 2012); doi: 10.1117/12.981131; https://doi.org/10.1117/12.981131
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