EISA mandates screw-based light bulbs that will use fewer watts for similar light output. Standards are technology neutral; any type of bulb (CFL, LED, etc.) can be sold provided it meets the efficiency requirements. Common household light bulbs that traditionally use between 40 and 100 watts will use at least 27% less energy by 2014.
EISA applies to the manufacture date and began with 100-watt bulbs in January 2012. It will work its way through the 75W and 60W bulbs, and end with 40-watt bulbs in January 2014. (California began the transition one year earlier.)
2011 Bulbs After EISA EISA Effective Date
100 watt 72 watts max January 1, 2012
75 watt 53 watts max January 1, 2013
60 watt 43 watts max January 1, 2014
40 watt 29 watts max January 1, 2014
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