by James Brodrick, U.S. Department of Energy Fluorescent lighting dominates the commercial sector in the U.S., and half of the country’s commercial fluorescent lighting fixtures are recessed troffers in 2’x4′, 2’x2′ and 1’x4′ configurations. Those troffers, which number in the tens of millions, are in use for more than 10 hours a day on average [...]