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Use this lamp to produce metal halide light with your 1000-watt high pressure sodium ballast. The 1000-Watt Sunmaster Metal Halide Cool Deluxe Conversion Lamp is the economical choice for gardeners that want to accelerate healthy vegetative growth while operating a HPS system. This is a BT-37 type lamp classified as universal to accommodate both horizontal and base up systems. This powerful lamp boasts 92,000 initial lumens and has a 9,000-hour life rating. Works with Harvest Pro, SS10, and Galaxy 1000w ballasts.