South Pacific Sunlight (SPS) Metal Halide bulbs are designed to replicate the beautiful shimmering light of your fish and coral's natural environment. These bulbs are specifically engineered to enhance the polyp extension, color, and growth of your corals. SPS Metal Halide bulbs are ideal for most Acroporas (SPS), Anemones, Clams, Hard Corals (LPS), Mushrooms, Polyps, Leathers, Xenia and other Soft Corals. This particular bulb is 150w double-ended 14,000k (Mid Sea Blue - representing 30-60 Ocean Depth Feet).