ETi 4 ft. Direct Replacement LED Tube Light is designed to replace existing fluorescent T8 tubes. It operates only with electronic ballasts and can be retrofitted without removing the electronic ballast from the existing fixture. It cannot directly replace inductive ballast type fluorescent tubes. This tube illuminates with crystal clear precision and uses superior energy-efficient LED technology. Ideal for kitchens, basements, classrooms, school hallways, offices, shops, shop windows, restaurants, museums, galleries, meeting rooms and hotel/motel locations.