... ,35w,54w 3.PF>99%,THD<10% 4.High quality balalst, 30000hr ceiling light fixtureCeiling light fixture Power: 2*14w,2*28w,2*35w,2 ... .Adopt high quality ballast,comply with 3C,TUV-CE standard3.High Power Factor(PF>99%),low THD(<10%)4.Use tri-phosphor powder fluorescent ... lamp,more brightness,high efficiency5.No noise,no flicker,low work temperature ...