ROBERTSON 3P10075 SP4827 AM Fluorescent mBallast for 1 F4T5, F6T5 or F8T5 Linear Lamp, Preheat Start, 277Vac, 60Hz, Normal Ballast Factor, NPF Save and order the 2P10075 Quik-Pak of 10 units, individually packaged 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.