HPS 400W lamp kit
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HPS high pressure sodium lamps are a very efficient source of light for indoor gardeners. The light radiates strongly, so the sodium lamp can penetrate the foliage of your plants. High pressure sodium lamps give a more natural light and a more continuous spectrum. The efficiency is 8500 to 13000 hours. A HPS 400W sodium lamp requires a ballast of the same wattage to operate.