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The U.S. Department of Energy (DOE) has published the final evaluation report from a retrofit of track lighting at the Smithsonian American Art Museum in Washington, DC. During the demonstration, LED PAR 30 and MR16 lamps replaced all traditional incandescent lamps in one gallery and LED PAR 38 and MR16 lamps partially replaced incandescent lamps in two other galleries. This GATEWAY demonstration report describes the selection and testing process, technology challenges, perceptions, economics, energy use, and mixed results of using LED replacement lamps in art galleries housing national treasures.