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Proceedings Paper

Design and manufacturing of LED primary optics for road lighting engine
Author(s): Jae Young Joo; Wan Ho Kim; Soon Sub Park; Sang Bin Song
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Paper 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%).

Paper Details

Date Published: 18 December 2012
PDF: 6 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85502O (18 December 2012); doi: 10.1117/12.981131
Show Author Affiliations
Jae Young Joo, Korea Photonics Technology Institute (Korea, Republic of)
Wan Ho Kim, Korea Photonics Technology Institute (Korea, Republic of)
Soon Sub Park, Korea Institute of Industrial Technology (Korea, Republic of)
Sang Bin Song, Korea Photonics Technology Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood; Marta C. de la Fuente; Jean-Luc M. Tissot; Jeffrey M. Raynor; Daniel G. Smith; Frank Wyrowski; Andreas Erdmann; Tina E. Kidger; Stuart David; Pablo Benítez, Editor(s)

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