electronic ballast 1.Power:14w,21w,28w,35w,54w 2.PF>98%,THD<10% 3. ... 30000hrs, three years warranty 4.Complied with TUV-CE,EMC electronic ballast ballast ... Power: 14w,28w,35w,54w,2*14w,2*28w,2*35w,2*54wballast Features: 1.ballast High Power ... Factor(PF>95%,THD<30%) 2.ballast Low harmonic, ...