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. SPS Metal Halide bulbs are manufactured with built-in igniters (starters) that allow them to be used with any type of ballast. This particular bulb is 175w, 14,000k (Mid Sea Blue - representing 30-60 Ocean Depth Feet).