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There are more than 50 million streetlights in the United States. From parking lots to park trails to bridges, these ubiquitous lights permeate our night lives and go largely unnoticed by the sustainability-inclined city dweller. But this necessary technology comes with a whopping energy cost. A 2009 University of Pittsburgh study shows most streetlights use high-pressure sodium bulbs. A 2012 survey by Northeast Group LLC was published in October, claiming 95 percent of U.S. cities that have tried LED streetlights are satisfied with the results, saving nearly 60 percent in costs. Yet, LED lighting currently accounts for only about 1 percent of the streetlights in the country.