Four-Bros Lighting HB4-T8/LED/18W/850 4 Lamp LED High Bay 4 Bulb/Lamp T8 LED High Bay Warehouse Shop Light Fixture-(4) LED T8 Single Ended Bulbs Included-11,440 Lumens Single-sided 18-watt LED T8 tubes included MAINTENANCE-FREE - No ballast-drama anymore. This 4 Lamp LED high bay light fixtures operates (4) LED T8 tube lights that bypass the ballast. Simply install the LED tube in its marked location and twist. Our LED high bays are rewired to operate 4 LED T8 Tubes ENERGY EFFICIENT - Replace costly T8 and T5 fluorescent high lighting fixtures with this LED Linear high bay light. Save 30% energy by switching to LED tubes. HOW DOES IT WORK - Each high bay Fixture is retrofitted and rewired when an order is placed. We install premium non-shunted tombstones and rewire them so that they accept a single-ended connection. Each T8 has a wide field angle, making them perfect for reflector equipped fixtures. They are DLC and UL listed. Each High Bay light is tested before being boxed and shipped. 5 YEAR WARRANTY - Buy with confidence, risk-free. Four Bros Lighting five-year warranty got you covered! Contact us for an easy and fast replacement.