... the light efficiency can increase 17%~20% 8, Electronic ballast TUV, IC standard quality for 20000hrs or 30000hrs ... inflaming retarding. 10, Installation: Mounting by screw fixing or series connection. 11, TUV, CE, RoHS approved 12, ... : Shanghai or ningbo 17,Power: HE series :4w 6w 8w 13w 14w 21w 28w 25w ... HO series:24w 39w 54w 49wApplication: Shopping, supermarket, school ...