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According to the U.S. DOE, four out of five lamps in service in commercial buildings 2010 were fluorescent, with a majority used in troffer (cross between “trough” and “coffer”) luminaires. Available in standard 1′x4′, 2′x4′ and 2′x2′ sizes, these luminaires are popular in applications featuring dropped acoustical-tile ceilings. In recent years, LED technology has challenged this venerable workhorse with energy-efficient and long-life alternatives. DOE estimates the installed base of LED troffers increased from an estimated 40,000 units in 2010 to nearly 700,000 units in 2012. Manufacturers report demand has escalated over the past two years, estimating that 15+ percent of new troffer luminaires sold today employ LEDs as the light source.