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The first report, dealing with lifecycle energy consumption for replacement lamps, was recently published: Review of the Life-Cycle Energy Consumption of Incandescent, Compact Fluorescent, and LED Lamps. The second report will address luminaires as well, and also incorporate environmental impacts. The study found that, based on DOE’s assumption that the average LED lamp provides service life equivalent to about 22 incandescent lamps, the average LED lamp consumes 75% less energy than the average incandescent lamp. Based on DOE’s assumption that the average LED lamp’s service life is equivalent to three compact fluorescent lamps, the average lifecycle energy consumption of LED lamps is about the same as that for compact fluorescent.
U.S. Dept of Energy gov buildings ssl tech reports