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36,000 lumens
400 Watt Metal Halide Conversion Bulb - Used with a 400w HPS Ballast.CONVERSION LAMPS - A). Sodium Lamps which run on halide ballasts -more common. B). Halide Lamps which run on sodium ballasts. This type of lamp allows you to tailor the light source to the growth stage of the plant (halide blue light for growth and sodium red light for flowering/budding) merely by changing lamps.  Works with SS10, Harvest Pro Elite, and Galaxy 400w ballasts.