Title :
Design of High Efficient Freeform Secondary Lens for Uniform LED Spot Lighting
Author :
Quoc Anh, N.D. ; Min-Feng Lai ; Hsiao-Yi Lee ; Hsin-Yi Ma
Author_Institution :
Dept. of Electr. Eng., Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung, Taiwan
Abstract :
The light intensity distribution and the illumination uniformity as well as the optical efficiency are the important issues for LED lighting. In this paper, we present a freeform lens design method to optimize the optical performances of the white light LEDs. The surface contour of the freeform lens is determined by the intensity distribution requirement of the LED spot light with uniform illumination. The experimental results show that the optical efficiency of 95.69% is achieved under a beam angle of 30 deg while the LED illumination uniformity can be enhanced from 0.064 to 0.317 as compared to the conventional freeform lenses.
Keywords :
lenses; light emitting diodes; optical design techniques; LED illumination uniformity; LED spot light; beam angle; high efficient freeform secondary lens design; light intensity distribution; optical efficiency; optical performances; surface contour; uniform LED spot lighting; uniform illumination; white light LED; Lenses; Light emitting diodes; Lighting; Optical reflection; Packaging; Shape; Vectors; Illumination uniformity; LED; Non-imaging optics; Optical engineering; Optical secondary lens design;
Conference_Titel :
Computer, Consumer and Control (IS3C), 2014 International Symposium on
Conference_Location :
Taichung
DOI :
10.1109/IS3C.2014.124
