Cities across the USA are making their streetlights brighter and greener by switching to LEDs.LED street lights cost more than traditional lights, but last longer because they don't have filaments and use less electricity.

LED street lights cost more than traditional lights, but last longer because they don't have filaments and use less electricity.

Cities likeAnn Arbor, Mich., and Anchorage, have installed LED road lights, and dozens more are planning replacement. It's said that until 2009, at least 30 cities have asked for over $104 million in federal funds to help them make the change.