Motion sensors instantly turn lights on when motion is detected and off when there is no activity for a desired period of time. Photo sensors measure the amount of daylight present and turn the lights on or off accordingly. Automatic controls for indoor lighting. Sometimes lights are left on for hours in unoccupied rooms, resulting in needless additional energy expense. Occupancy sensors detect activity within a certain area and switch lights off if no activity is detected.
Ultrasonic sensors detect sound while infrared sensors detect heat and motion.
Incandescent light bulbs are more effective at producing heat than light. During the summer, this heat increases interior temperatures and adds to the cooling load of a home. Energy efficient lighting technologies produce less waste heat and thus improve comfort in cooling-dominated climates. Lower utility bills. Improved safety and security.