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The Energy Department plans to strengthen its energy-efficiency standards for certain types of light bulbs by up to 12.9 percent over current levels. The proposed standards, announced in a notice published on its website April 11, could cost companies and consumers $100 million or more to develop and purchase higher-efficiency bulbs. The proposal affects general service fluorescent lamps (GSFLs), which includes fluorescent tube lamps that are commonly found in office buildings, and incandescent reflector lamps (IRLs), commonly used in recessed and track lighting.