PHILIPS ADVANCE, CENTIUM, Lamp Type: T5 28W, Number Of Lamps: 1 or 2, BALLAST TYPE: Electronic Fluorescent, Voltage Rating: 120-277 V, Length: 9.5 IN, Width: 1.3 IN, Height: 1 IN, Lamp Starting Method: Programmed Start, Power Factor: High, Ballast Factor: 0.85