SWX-250-2-D Line Voltage Ceiling Mount Daylight Harvesting Photocell SensorSensorWorx line voltage photocell and daylight harvesting sensors provide a compact control solution without requiring a powerpack. Basic on off units are capable of directly switching lights off when ambient levels are high enough that desired overall light levels will be still be maintained. Lights will be switched back on once ambient level falls below the desired setpoint. Units with the daylight harvesting (dimming) option track a spaces overall