If you can't remember the last time you replaced your holiday lights, chances are you're still using strings with incandescent bulbs. LED holiday lights save energy and money! While they can be more expensive to buy than incandescent lights, low-powered LEDs cost much less to operate, making them the more affordable, energy efficient option. So this year, switch your old incandescent holiday bulbs to LEDs and show your holiday spirit in a whole new energy wise light.