I assume the figures come from the EPA-DOE Energy Star program:
Quote:
If every American home replaced just one light bulb with an ENERGY STAR qualified bulb, we would save enough energy to light more than 3 million homes for a year, more than $600 million in annual energy costs, and prevent greenhouse gases equivalent to the emissions of more than 800,000 cars.
Compact Fluorescent Light Bulbs : ENERGY STAR
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In any case, incandescent light bulbs will be banned in the US starting in 2012.