GE Lighting UltraStart Proline Electronic Ballast, 120/277 Volt Program/Rapid Start Ballast, Normal Ballast Factor, Ballast for Fluorescent Light (1) or (2) Lamp T12 - Electric Plugs - Amazon.com
Philips Advance Centium 30/34/40 Watt 1 or 2 Lamp T12 Rapid Start High Frequency Electronic Fluorescent Replacement Ballast 520460 - The Home Depot
Philips Advance Electronic Ballast 120V to 277V for (3 or 4) F32T8 | ICN4P32N35I | Bulbs.com