SWX-250-1-D Low Voltage Ceiling Mount Daylight Harvesting Photocell SensorSensorWorx photocell sensors control lighting according to measured ambient lighting in a space. Basic on off units signal a connected power pack to turn lights off when ambient levels are high enough that desired overall light levels are maintained. Units with the daylight harvesting (dimming) option track a spaces overall illumination and dim connected lighting to achieve energy savings. During times of high daylight contribution to a space,