What is the definition of a office light sensors? Office light sensors are devices that detect changes in the amount of light in a given area and respond by adjusting the lighting accordingly. The two most common types of office light sensors are occupancy sensors and daylight sensors. Occupancy sensors detect the presence of people in an area and will switch the lights on when someone enters the area and off when they leave. Daylighting sensors measure the amount of natural light coming through a window, and will dim or switch off electric lights depending on the natural light levels. Office light sensors can help to reduce energy costs by ensuring that electric lights are only used when they are actually needed. They can also help to improve comfort levels in the workplace by adjusting the lighting levels to suit the task at hand or to create a more pleasant atmosphere.