NGTlight 250 Watt LED Corn Cob Light ( Retrofit 1000W Metal Halide) E39 Mogul Warehouse High Bay Lighting 6000K AC100-277V UL cUL Easy to install: Bulb with an E39 mogul screw base, making it a super easy LED retrofit and incandescent/metal-halide replacement. In most cases, just screw in. In others, since LEDs use a driver and not a ballast, you must bypass the ballast (Halide and other bulb types). Consult your electrician. LED Lights Factory, all lights are produced by ourselves Low power consumption. Save more than 80% in electricity compared with conventional high pressure sodium and metal halide lamps. Application: Only suitable for Open Fixtures,widely Uesd For High Bay Fixtures,Gyms,Warehouses,Garages,Workshop,ect. Certification and Warranty: UL DLC approved, 5 Years warranty direct from NGTlight