Yosemite National Park offers stunning views of mountain vistas during the day and star-filled skies at night. This view often includes the Milky Way -- invisible to almost one third of Earth’s population due to light pollution.
Artificial lighting is restricted in Yosemite, but some areas in the park require lighting, such as parking lots and pathways between buildings. Light pollution can not only have a negative effect on visitors’ experiences, but can also change the natural rhythms of the park’s wildlife.
University of California, Merced (UC Merced) graduate student Melissa Ricketts has found a solution – by turning one of her professor’s inventions upside down. In an article from UC Merced’s University News, Ricketts describes what she calls “prescribed irradiance distribution.”
Ricketts is a member of UC Solar, a multicampus research institute headquartered at UC Merced headed by Roland Winston, the inventor of nonimaging optics. His compound parabolic concentrator (CPC) is a key piece of solar-collecting equipment in the emerging solar energy industry. Ricketts has developed a way to make Winston’s CPC emit light rather than gather it.
“It’s the reverse of the solar collector,” Ricketts said. “We can make a perfect square of LED light, or a circle, or whatever shape works best to illuminate only what needs to be illuminated.
UC Merced graduate student Melissa Ricketts sets up her LED
lighting solution in the Sand Pile at Yosemite National Park
Credit: Courtesy of UC Merced
Yosemite is cautious about introducing new technology into the park, but they have been supportive of Ricketts’ research toward managing light by letting her use the area as a test where her work could eventually have global implications for wildlife and park visitors.
“We’re hoping to show the park we can eliminate the unnecessary light,” Ricketts said. She’s currently seeking funding to make the project viable for Yosemite and other parks