Light exactly when and for as long as you need it! The F&H Jaso BS ceiling light has a motion detector. The BodySensor is integrated directly into the wall or ceiling, so no additional motion sensor is required. It recognizes you from several meters away and lights up the room for you. This is especially useful in hallways, basements or attics. It depends on you at what distance, at what time or at what degree of darkness the sensor is activated and for how long the light is on.