Aluminum backing for excellent thermal management. 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. 720 PCS High Output LED's. High power factor, low THD internal driver. InstantON flicker-free Cold Start and Hot Re-Start. Up to 15 years Maintenance free operation. 5 Year Warranty.