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Does hight of the plant matter? What I mean is, you say that 250W HPS is good for 2'x2' grow space, but does the height of the plant matter? I've read places that, not specific to our favorite plant, the taller the plant, the more wattage you need. So for a 2'x2' grow space with three 4' tall plants, would I need more along the lines of 400W HPS?
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