LED Lamp, 12W, Voltage: 120-277, 347 VAC (Ballast Dependent), Bulb: T8, Length: 48", Base: Medium Bi-Pin (G13), Lumens: 1380 (LBF), 1850 (NBF), 2480 (HPF), CRI: 80, Color Temperature: 5000K, Rated Average Lifr: 50,000 Hrs. Approved for open and enclosed fixtures ***Warning: Works on Compatible Instant Start Electronic Ballasts *** See Catalog page for compatibility chart. NOTE: Use shunted sockets for Instant Start ballasts. Use non-shunted sockets for Rapid, Programmed, and Dimmable ballasts.