400 Watt 20,000K Metal Halide Double Ended BulbEmits a Vibrant, Deep Actinic Blue Light with high spikes in the 420nm range Simulates sunlight at ocean depths of 8 20 ft Promotes the development of photosynthetic plants, anemones and coral Suggested Metal Halide Wattage Guide: 400w for tank depth of 24" 48" Use with 400 watt M135 ballast or 400 watt Electronic Ballast Hamilton Technology brand
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