LED light bulbs are the best energy saving option on the market today. They are roughly 80% more energy efficient and their life expectancy is up to 20 times longer than traditional light bulbs. If you switch to LED's your cooling bills will go down as well because they produce much less heat than incandescents, compact fluorescents, HID lamps, etc. Many manufacturers also offer a 3-5 year warranty on LED light bulbs so your replacement costs will decrease. Make the switch to LED and start saving money today.