Sunlight Direct's Hybrid Solar Lighting: Fiberoptic Brilliance

THE BEST OF GREEN DESIGN: As much as 90 percent of the energy used in incandescent lighting is shed as waste heat. Natural light leaves the heat where it should be in the sun.

Hybrid Solar Lighting by Sunlight Direct channels visible light into buildings through a bundle of plastic optical fibers. These fibers hook into special luminaires that distribute the light indoors. As daylight wanes, a sensor kicks on conventional electric bulbs to maintain a constant level of illumination.

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Related Story: Solatube's Reflective Daylighting System


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A parabolic dish tracks the sun and feeds its rays into a cable composed of 127 optical fibers. Just two fibers deliver light equivalent to a 50-watt incandescent bulb. (Diagram by Brian Brasher)
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