Pub. L. 110-161, div. F, tit. IV, sec. 431

Sec. 431. None of the funds made available in this Act may be used to purchase light bulbs unless the light bulbs have the “ENERGY STAR” or “Federal Energy Management Program” designation, except in instances where the agency determines that ENERGY STAR or FEMP designated light bulbs are not cost-effective over the life of the light bulbs or are not reasonably available to meet the functional requirements of the agency.