According to a survey by Lutron Electronics, 47% of Americans consider leaving lights on in empty rooms to be the biggest waste of electricity in their homes. While energy efficient light bulbs help reduce energy bills, light control devices can further address wasted lighting by automatically turning lights off when rooms are empty. Installing sensors that detect motion or daylight can help cut back on wasted lighting with an initial investment of $15-50 that may pay for itself quickly. However, households should ensure any new sensors will work with their bulbs like CFLs or LEDs before investing in light control devices for every room.