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The End of the T12 Era by Craig Dilouie

On July 14, 2012, Department of Energy (DOE) rules regulating general-service fluorescent lamps will go into effect, eliminating many popular models. About 30 percent of linear fluorescent lamps sold each year are T12s, servicing an estimated 35–40 percent of fluorescent sockets in industrial/commercial applications as well as 70 percent of fluorescent sockets in residential applications. The T12 phase-out will dramatically accelerate a shift in demand to T8 and T5 lamp/ballast systems.