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2009 Solar Decathlon | by lumenhaus
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2009 Solar Decathlon

Energy efficient lighting illuminates the solar-powered Virginia Tech house, right, during the 2009 U.S. Department of Energy Solar Decathlon on the National Mall in Washington, D.C., Saturday, Oct. 10, 2009. (Photo by Stefano Paltera/US Dept. of Energy Solar Decathlon)

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Taken on October 10, 2009