Optical Design of LED Street Lamps
Date Issued
2011
Date
2011
Author(s)
Kang, Yu-Ling
Abstract
Based upon the practical specifications of street illumination, we design the secondary optical elements so that the LED illumination can be transformed into a uniform illumination on the road to meet the street illumination standards. Generally, LED light intensity distribution is Lambertian, however, the geometry of the road area are rectangular. Therefore, traditionally symmetric design of an original LED lens can only produce uniform illumination on a circular area. A major portion of light will fall outside the street and will results in unnecessary power consumption, environmental light pollution, the glare issues, and even traffic accidents, etc. Consequently, the lens design should be asymmetric in order that the emitted light can be distributed uniformly in the directions parallel and perpendicular to the driving direction and thus can achieve uniform illumination within the rectangular area of the road. In this thesis, free-form lens and reflector are developed to create a batwing light intensity distribution in the direction parallel to the driving direction and asymmetrical intensity distribution in perpendicular direction to create a rectangular light pattern and achieve high efficiency of uniform illumination. Finally, our simulations validate their compliance with the street lighting specifications.
Subjects
Street lighting
free-form lens
reflector
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R98941061-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):8f83db1eff0355b80159be2784a7f033