Super bright, gives off 1000 lumen, 85% saving, 12W LED replace 100W bulb. The light bulb stays on 25~30S,then the detector automatically shuts the light off unless it continues to sense movement. For best effectiveness, position a motion sensor light to cover the walks leading to your front and back doors and the driveway Built-in a photocell sensor, deactivates the motion sensing light bulb during the daylight hours to save . Winter sensor range diameter is 13ft-20ft, but in summer the sensing area diameter is 6ft-10ft, it is only half of winter. Its best to mount this motion sensor light bulb 6-10ft. above the ground and position the motion sensor towards to the sensitivity zone.