ROBERTSON 3M10765 Fluorescent mBallast for 1 F25T12 Linear Lamp, Pre-Heat 120 Vac, 60Hz, Normal Ballast Factor, NPF, Model SP258 /B Offering the broadest ballast/LED Driver line available on Amazon. Selections to match any lighting application. Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Robertson warrants product will be free from defects in material or workmanship from date of manufacture when properly installed and under normal conditions of use. Go to RobertsonDirect.com for complete technical data.