Aqua Bright Solutions 250 Watt 10,000K Metal Halide Double Ended BulbCrisp White True 10,000 Kelvin white bulb Emits a Pure, Crisp Intense Bright White light with a high PAR value Simulates sunlight at ocean depths of 5 15 ft Promotes the development of photosynthetic plants, anemones and coral Suggested Metal Halide Wattage Guide: 250w for tank depth of 24" 48" Use with ballast ANSI code M80 or 250w Electronic ballast