Replaces existing T12 tubes for sign lighting applications. Aluminum middle for excellent thermal management. Double sided optics for direct / indirect lighting systems. Frosted non yellowing polycarbonate lens for even glow. (Glare Free). Correlated Color Temperatures of 3500°K, 4100°K & 5000°K. Mercury free design. No radiated EMI interference. High Output LED's. High power factor, low THD internal driver. 5 Year Warranty.