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With an urgent demand for energy efficiency, lighting continues to stake its claim as a solution. T8 and T5 fluorescents—both important evolutions in improved lamps and ballasts—have been landmark offerings and have successfully illuminated interior spaces for decades. Now lighting installers have a new option: a number of major and smaller lighting companies offer linear LED tubes, some with retrofit kits. Their chief advantage has been their lumens-per-watt, sometimes bettering high-quality fluorescent lamps.