Contractors install energy-efficient lighting in an aircraft hangar at Holloman AFB, N.M. The high-output fluorescent lighting is expected to save 40 percent of energy compared to the old lighting. By reducing energy Consumption 35 percent over the past two decades, the Air Force avoided paying an additional $500 million in utility costs. (U.S. Air Force photo by Airman 1st Class Eileen Payne)
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