Outdoor holiday lights are a festive way to bring illuminating charm to your home and neighborhood. But even energy-efficient string lights should be turned off late at night. Not only do they still use energy, but nocturnal birds often get confused by the bright lights. One easy way to turn off the lights is to use your smartphone. The app X10 Controller can turn off the decorations with the push of a button. You can also use a timer that automatically turns your outdoor light on and off each day.