Naturallighting com is a factory direct distributor for Sunpark ballasts. Sunpark Ballast, SL15T. Rapid Start, 120 volt. Lamp Type - 2 - F32T8, 2 - F25T12, F34T12, F40T12, F25T8, CFQ26W, DFM32W, PL 36, 39 and 40W. This ballast will also operate (2 bulbs) 1 - 22 watt circline and 1 - 32 watt circline. Power Factor - 0.50, THD - 130%, Ballast Factor - 0.88, Minimum Start Temperature - 0 Degree F. Dimensions - Length - 6.0", Width - 1.78", Height - 1.08". Will work in fixtures with older SL15T ballasts, just have to follow new wire diagram on ballast. This ballast does not have circline sockets, Sunpark SL15T-1 has circline sockets.