This Precision Lighting and Transformer F15T8 linear fluorescent tube has a color temperature of 4200K, medium bi-pin base, and an average life of 8,000 hours. It is protected by a shatter resistant P.E.T coating. The PET coating around the tube has U.V. protection against yellowing, fading, and clouding. It is extremely strong, puncture resistant, and lightweight. These fluorescent lamps are perfect for any residential or commercial application. Case contains 25 lamps.