Parshield® -- the patented clip-on visor for outdoor PAR-38 floodlight and spotlight bulbs. The Parshield visor turns an ordinary flood light into neighbor friendly shielded lighting. With our light shields and proper aiming, you can eliminate light trespass and preserve the dark sky.
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Links to light pollution-related organizations, manufacturers, and more.
United States Patent, #6,497,501. Issued: December 24, 2002. Parshield® is Trademarked: Serial #76381699. Registered, January 14, 2003.