70W HQI Double Ended 20,000K Metal Halide Aquaruim/Reef 20000K 70 Wat Bulb Lamp Wattage: 70W ,Bulb Shape: T6 - Base Type: HQI Double-Ended, Length: 4.60" Excellent Choice for Reef Tanks 12" to 48" in Depth 8,000 Hour Long Life Lamp Operates on a HQI Metal Halide Ballast, Pulse-Start Ballast or Electronic Ballast