Hello I'm looking to expand my current 2x4 grow space to a 4x4. I run 1 SF 2000. Should I get 1 more SF 2000 or return my light and get the SF 4000?
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I agree with @quadtrax ... Also, if you have different size plants, you have more flexibility to adjust the light distance since you have two lights instead of just one covering the whole space.
2 SF2000 (spaced correctly) will cover more area then 1 SF4000.