... 99%,THD<10% 4.High quality balalst, 30000hr ceiling light fixtureCeiling light fixture Power: 2*14w,2*28w,2*35w,2* ... 99%),low THD(<10%)4.Use tri-phosphor powder fluorescent lamp,more brightness,high efficiency5.No noise,no flicker,low ... 45%7.Installation:Ceiling mounting, series connectionApplication: House lighting, shopping mall,refrigeratory,show case,hotel,office etc ceiling light fixture (2*28w)