Mercury Vapor Lamp: LP-AI-MV400 Wattage (W): 408 Lamp Voltage (V): 137.4 Lamp Current (A): 3.25 Lumens Output (Lm): 22633.1 Light Effency (Lm/W): 55.5 Power Ratio cosˆ: 0.91 Color Temperature(K): 4926 Color Rendering (Ra): 29