The capability to provide artificial sunlight has dramatically expanded the boundaries of time and space, adding hours to the day when we may see and illuminating where sunlight was unable to penetrate. Since the first humans carried a torch to provide light, heat has been a by-product of producing light.
Traditional electric lights continue to give off more heat than light. An incandescent light bulb uses a paltry 10 percent of its energy to create light. Fluorescent lighting -- which has been the green standard in energy efficiency -- still wastes nearly half of the electricity it consumes in generating heat. All of this lost energy is significant considering that lighting devours more than a quarter of a typical commercial building's electricity, as reported by the U.S. Energy Information Administration.
Read more: http://www.greenbiz.com/blog/2010/09/02/spotlighting-green-benefits-leds#ixzz0yNUcx0tm
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