LED -- light-emitting diode -- lightbulbs are all the rage now. But when shopping for the energy-efficient and long-lasting bulbs, look for ones that are marked with the Energy Star-approved label. In addition to being tested for quality, these bulbs also pass tests for consumer satisfaction. According to Energy Star, LED bulbs "emit light in a specific direction, unlike incandescent and CFL bulbs, which emit light and heat in all directions." That means some LED bulbs can cast light ineffectively in just one direction, giving limited lighting in a room. Energy Star-approved LED bulbs meet specific requirements to replicate the look, feel and distribution of conventional lightbulbs, so you'll reap energy and monetary savings without sacrificing experience.