E-lite led high bay provide nice, brilliant illumination with nearly maintenance free. With modular design and latest technology in LED illumination, E-lite led high bay delivers beautiful, high quality, with extraordinary optic control. That not only saves your cost from the high light efficiency but also the optic control. The latest light control will switch the light on or off as you need. With the passive infrared sensor, ultrasonic sensor, dual sensors, the led lamp s will on or off at the right time. From a recent investigate from E-lite end-user, the sensors will help save 30 percent to 40 percent energy costs. When there is no detection of activity, the led lamps will be turned off by the sensor. Once there is a motion in the area where there is a sensor, the led lamps will switch on or become brighter instantaneous. These sensors only used in the led lamps, the high pressure sodium takes too long to warm up.