Lithonia Lighting IBZT5 6L Fluorescent High Bay Light, White UL listed, 6 light T5, lamps included Ballast: MVOLT 120-277v ballast accommodates most electrical requirements, thermally protected, resetting, class P, HPF, a+ sound-rated electronic ballast Rugged fixture construction coupled with excellent fixture performance Narrow distribution, one 4-lamp and one 2-lamp program start electronic ballasts, lamps installed