Charles T. TroyOAK RIDGE, Tenn. -- Using collectors to gather sunlight and optical waveguides to transport the light, researchers at the US Department of Energy's Oak Ridge National Laboratory have put together the first pieces of a hybrid lighting system that will combine artificial light with natural light. It is expected to eventually trim the nation's electric bills -- currently estimated at $75 billion. "Hybrid lighting holds great promise for improving quality and efficiency of lighting," said Art Clemons, a co-developer of the system. 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