Philips Advance Centium 40W (F40T12) 1 or 2 Lamp 4 ft T12 120-Volt Rapid Start High Frequency Electronic Fluorescent Replacement Ballast 520460 - The Home Depot
Advance Ballast - Philips Advance Ballasts, making lighting cheaper and efficient: Information, replacements for T5, T8, & T12
Advance 72C5081NP F-Can Metal Halide Ballast | BulbsDepot.com