Under federal light bulb efficiency standards approved in 2007, old-style 100-watt incandescent bulbs will be phased out this year. Taking their place are bulbs, that by law, must be 25 to 30 percent more energy efficient.
Among the most popular are CFLs, or compact fluorescent lights. Those bulbs tend to be more expensive than the standard incandescent bulbs.
Seventy-five-watt bulbs are set to be phased out next year followed by 40 and 60-watt bulbs in 2014.