1. high bay light 2.Operating frequency:250KHZ 3. 5 years warranty 4. Life time>100000hours ... light1.Energy Saving Compared with HID lamps,the save 70% enevgy,similar to new fluorescent lamps of high energy saving,which creat ... tunnels,roads ,high bay areas,Ceiling Lights has a wide operating temperature,and is good for emergency and extreme climates. 3 ...