... and solid mecury,high efficiency,1*28w,2*28w double fluorescent lighting fixture Power: 2*28w,2*35w,2*54w Features: 1 ... (PF>99%),low THD(<10%) 4.Use tri-phosphor powder fluorescent lamp,more brightness,high efficiency 5.No noise,no flicker ... to 45% 7.Installation:Ceiling mounting, series connection Application: House lighting, shopping mall,refrigeratory,show case,hotel,office etc