If you come home after dark, or like using your yard when it's dark out you probably have some light fixtures outside (or fumble through the yard a lot). These fixtures can drain power, particularly if you need them to be on when you come home. Also, these fixtures can't use CFL bulbs in a lot of climates because the cold will wreak havoc with them. Solution: An outdoor light that charges from the sun during the day and comes on automatically at night.