Those humming orange lights that illuminate your city streets typically rely on High Pressure Sodium bulbs (HPS)—cheaper and longer lasting than other conventional options, sure, but not exactly energy efficient. No worries though, they may soon be obsolete thanks to these LED street lamps powered by the sun and wind.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/t9xaJ_pxs6Q/street-lights-of-the-future-will-be-powered-by-the-sun-and-wind
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