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Compatible with 600-watt high pressure sodium (HPS) ballasts, the blue-spectrum light of the 600-watt OptiLUME Metal Halide Conversion Lamp simulates the summer sun, promoting lush overall plant growth. This lamp produces 57,000 initial lumens and has a 4,200-kelvin color temperature and 10,000-hour lifespan. A one-year warranty is included. This conversion lamp is not recommended for use in electronic ballasts.