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.
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