Optical parameter High bay light Characteristic 1.Lamp made with newly special technic & design ensure the LED`s temperature no more than 60°C. 2.Adopted our patent LEDs --- No.ZL2008.2.00042273. 3.Long lasting life & low maintaining cost,easy installation. 4.Brightness of 100W LED High Bay Lamp similar to 250W traditional high sodium lamp. 5.No pollution to environment such as hydrargyrum,fluorescence powder. 6.Better used in places of factories,gas stations and warehouses,etc.Distance to ground 5-8m(suggested).