ROBERTSON 2P10075 SP4827 AM Quik-Pak of 10 Fluorescent mBallasts for 1 F4T5, F6T5 or F8T5 Linear Lamp, Preheat Start, 277Vac, 60Hz, Normal Ballast Factor, NPF Also available as a single quantity as 3P10075 UL Listed (Type 1 Outdoor), Meets ANSI C82.1, RoHS Compliant, No PCBs Sound rated A, Series operation Two Year Factory Warranty. Go to RobertsonDirect.com for complete technical data.