What is the definition of a occupancy sensors for lights? Occupancy sensors are devices that detect the presence of people or animals in a space and automatically turn lights on or off. They are commonly used in commercial, industrial, and residential settings to conserve energy and improve safety. Occupancy sensors are usually mounted on ceilings or walls, and can detect motion from up to 30 feet away. They are equipped with infrared technology, which picks up subtle changes in the body’s movement and temperature, and can differentiate between people, animals, and other objects. The sensors are programmed to respond to people entering and exiting the space, and to adjust the lights accordingly. Occupancy sensors may also feature a manual override, allowing users to override the automated system and control the lights manually if desired. Commercial and industrial buildings often use occupancy sensors to reduce energy costs by decreasing the amount of time lights are left on while the space is not in use. In residential settings, occupancy sensors may be used in areas such