250W watt HQI 22000K Aquarium Double Ended Fc2 Metal Halide Vivid Blue (DE) 22K Bulb Lamp Color Spectrum: 22,000k (Kelvin) Pure Vivid Blue Excellent Choice for Reef Tanks 12" to 48" in Depth Length: 6.40" , Bulb Shape: T9.5 Operates on a HQI Metal Halide Ballast, Pulse-Start Ballast or Electronic Ballast Includes Free Gloves for Handling