... .Iron body with reflector 4.High quality ballast,25000hr double fluorescent lighting fixture Power: 2*14w,2*28w,2*35w,2*54wFeatures ... (PF>99%),low THD(<10%)4.Use tri-phosphor powder fluorescent lamp,more brightness,high efficiency5.No noise,no flicker,low ... up to 45%7.Installation:Ceiling mounting, series connectionApplication: House lighting, shopping mall,refrigeratory,show case,hotel,office etc ...