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

fYear

2014

fDate

10-12 June 2014

Firstpage

450

Lastpage

453

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer, Consumer and Control (IS3C), 2014 International Symposium on

Conference_Location

Taichung

Type

conf

DOI

10.1109/IS3C.2014.124

Filename

6845916