Building: Heat by Light

As anyone reading a book on a hot night has discovered, a light bulb puts out a lot of heat. When bunched together in overhead banks, as they are in most modern office buildings, lights can make interior rooms too hot — even in the dead of winter.

Until recently, builders did little but complain about the problem, spent considerable amounts of money air-conditioning inside rooms at the same time they were heating outside rooms—particularly in glass-walled buildings, whose outside rooms not only lose a great deal of heat in winter but get cooked by the summer sun. Finally,...

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