OSRAM Opto Semiconductor has completed a detailed life cycle analysis of traditional incandescent bulbs, CFLs, and LEDs.
Although it's been recognized for quite a while that incandescent bulbs are far inferior to CFLs and LEDs for energy efficiency during use, it's less obvious how the three technologies compare when *all* of the inputs (manufacture, transportation, disposal, etc.) are considered. Their findings were that CFL and LED lamps use less than 670 kWh of primary energy during their entire life, compared to 3,302 kWh for a traditional incandescent (for a lifetime of 25,000 hours). Other concerns besides energy consumption were studied as well, and you find this information in the executive summary linked to by this post.
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