Occupancy sensing is a core energy management technology in smart lighting. It detects whether people are present in a space and controls lights accordingly-turning them on when someone enters and dimming or switching them off when the area is empty. Common sensor types include PIR (passive infrared), ultrasonic, and microwave. PIR sensors are cost-effective for small rooms, while ultrasonic and microwave sensors offer better coverage and can detect minor movements, such as someone sitting still at a desk.
The energy-saving potential is substantial. In restrooms, conference rooms, stairwells, warehouses, and parking garages, occupancy sensing can reduce lighting energy use by 30–50%. In offices, it prevents lights from burning all night in empty meeting rooms. Combined with daylight harvesting, savings can be even greater.
Modern systems also support "vacancy" mode, where lights must be manually turned on but switch off automatically when the room is empty-ideal for classrooms and hotel rooms. For independent site owners, this topic attracts facility managers, builders, and homeowners looking for proven ways to cut energy costs. A clear, benefit-focused article on occupancy sensing can position your site as a trusted source for smart lighting knowledge.
