Solatube International Inc. has launched the Solatube Smart LED System, which saves up to 94 percent on lighting energy use. It harnesses the sun’s daylight and as light levels dim, its sensors activate LED lighting. The system has an optional occupancy sensor that activates the LEDs only when a low-light area is occupied. It can be turned on or off when connected to a wall switch. An optional daylight dimmer allows users to adjust light levels.