Pulse Start Lamps provide superior performance compared to standard Metal Halide Lamps. Pulse Start Lamps offer higher efficacy, better color, uniformity, faster warm up, and longer life. The Pulse Start Lamp systems result from new body arctubes, and new ballast designs. All Pulse Start Lamps must use Pulse Start Ballasts. All lamps are 4000K Color Temperature and 65 CRI.