Light pollution has become a prominent issue, specifically in National Parks such as Yosemite, where visitors go to enjoy the natural ‘night sky’. In an effort to reduce light pollution, a particularly obtrusive light source has been selected for retrofit. Using nonimaging optics and light emitting diodes (LEDs), light can be controlled to achieve a desired prescribed illumination distribution. This distribution possesses a sharp cut-off such that light leakage is minimal. Nonimaging optical designs are 3D printed, retrofitted into the candidate fixture, and tested in Yosemite National Park. The end goal is to drastically reduce and even eliminate the excess light from sources around the park.

Date Published: 7 September 2016
PDF: 13 pages
Proc. SPIE 9955, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIII—Commemorating the 50th Anniversary of Nonimaging Optics, 99550G (7 September 2016); doi: 10.1117/12.2239506

Published in SPIE Proceedings Vol. 9955:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIII—Commemorating the 50th Anniversary of Nonimaging Optics
Roland Winston; Jeffrey M. Gordon, Editor(s)