"ADVANCE" ELECTRONIC BALLAST *9.5" L x 1.7" W x 1.18" H *Intellivolt electronic ballast for (1-2) F72T8, F96T8 or F96T8ES lamps *Approved for commercial applications *Input voltage 120V or 277V *Input frequency 50/60 hertz *Ballast factor (1) light 1.05 (2) light .87 *Ballast efficacy factor (2) light F96T8 .81 (2) light F968/ES .84 *Max THD percent: 10% *Minimum start temperature F96T8 32 deg. F and F96T8/ES 60 deg. F *UL listed and CSA certified *Boxed *Discovery HWU