DescriptionCompact fluorescent light bulbs, or CFLs, use about 75% less energy, give off 90% less heat, and last up to…more »Compact fluorescent light bulbs, or CFLs, use about 75% less energy, give off 90% less heat, and last up to ten times longer than old-fashioned incandescents. Changing over is as easy as… well, screwing in a light bulb. « less