Specifications: 1) High luminous efficiency 2) instant start, flicker free 3) save 80% energy 4) color temperature for option (2700K, 3200K, 4100K, 5500K, 6400K) 5) Tube dia.: Φ12mm (T4), or Φ9mm (T3) 6) UL, CE approval, UL file No.: E243260 7) 9W, 11W, 13W, 15W, 20W, 24W for option 8) 110-130V, 220-240V voltage for option 9) 5,000-10,000 hours working life time