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January, 2018 marks the effective date for a 2015 Federal Department of Energy rule-making that tightened the energy efficiency requirements for certain fluorescent T8 lamps. The category of lamps most affected are the 4-foot medium bipin T8 fluorescent lamps. These lamps must now achieve a minimum 92.5 lumens per watt efficacy - a 3.8% improvement over previous standards. The 2015 regulations have a smaller impact on other T8 fluorescent lamps. Manufacturers can no longer make non-compliant T8 lamps after January, 2018. Distributors and resellers may continue to sell non-compliant T8 lamps until inventories are gone.