TY - JOUR
T1 - Optical design of rectangular illumination with freeform lenses for the application of LED road lighting
AU - Xu, Chunyun
AU - Cheng, Haobo
AU - Feng, Yunpeng
N1 - Publisher Copyright:
© 2017, Higher Education Press and Springer-Verlag GmbH Germany.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - We present a freeform lens for application to light-emitting diodes (LED) road lighting. We propose a simple source–target luminous intensity mapping method based on Snell’s law and geometric-optics analysis. We calculated different contours of cross-sections to construct a freeform lens with a smooth surface. The computer simulation results show that the lighting performance of a single freeform lens is not sufficient for road lighting. For the road lamp simulation, we adopted an oval arrangement of freeform lenses on a printed circuit board. In addition, we performed tolerance analysis to determine the tolerance limits of manufacturing and installation errors. A road lamp at a height of 12 m can create rectangular illumination with an area of 40 m × 12 m, 69.7% uniformity, and average illuminance of 24.6 lux. This lighting performance can fully comply with the urban road lighting design standard.
AB - We present a freeform lens for application to light-emitting diodes (LED) road lighting. We propose a simple source–target luminous intensity mapping method based on Snell’s law and geometric-optics analysis. We calculated different contours of cross-sections to construct a freeform lens with a smooth surface. The computer simulation results show that the lighting performance of a single freeform lens is not sufficient for road lighting. For the road lamp simulation, we adopted an oval arrangement of freeform lenses on a printed circuit board. In addition, we performed tolerance analysis to determine the tolerance limits of manufacturing and installation errors. A road lamp at a height of 12 m can create rectangular illumination with an area of 40 m × 12 m, 69.7% uniformity, and average illuminance of 24.6 lux. This lighting performance can fully comply with the urban road lighting design standard.
KW - freeform lens design
KW - light-emitting diodes (LED)
KW - nonimaging optics
KW - rectangular illumination
UR - http://www.scopus.com/inward/record.url?scp=85039071870&partnerID=8YFLogxK
U2 - 10.1007/s12200-017-0707-7
DO - 10.1007/s12200-017-0707-7
M3 - Article
AN - SCOPUS:85039071870
SN - 2095-2759
VL - 10
SP - 353
EP - 362
JO - Frontiers of Optoelectronics
JF - Frontiers of Optoelectronics
IS - 4
ER -