ROBERTSON 3M10687 S1527P /I mBALLAST, NPF, 277Vac., 60Hz, (1)13TT-2 V2 Offering the broadest ballast/LED Driver line available on Amazon. Case Style 8 Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience. Commerical grade. Two year warranty. Go to RobertsonDirect.com for complete technical data.