Occupancy sensors increase lighting energy savings by turning off or turning down the lights when Ceiling-Mounted Occupancy Sensors. The PIR sensor . The OMNI Ceiling Mount Vacancy/ Occupancy Sensor is designed for medium . or out of a sensor zone, the sensor detects motion and switches the lights ON. Leviton's Wall Switch and Ceiling Mounted Occupancy Sensors use passive infrared or ultrasonic sensing technology to provide cost- effective lighting control. The Dimming Fixture Mount High Bay Sensor provides 0-10V control and . Motion sensing lighting control that is used for energy savings and convenience. OccuSwitch wall switch and low voltage occupancy sensors automatically turn lights off when a work space is unoccupied, . - Philips.