According to the Environmental Protection Agency's Energy Star program, "lighting accounts for close to 20 percent of the average home's electric bill." So instead of using old-fashioned incandescent bulbs, make the switch to energy-efficient compact fluorescent bulbs. According to Energy Star, CFLs can "use up to 75 percent less energy than incandescent light bulbs and last up to 10 times longer." Help out friends and family, too, by buying CFLs in bulk at stores like Costco and Sam's Club. Share the eco-wealth and save some money too.