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Be Irie Legalize09 Be Irie wrote on Legalize09's profile.
I let the temp tell me how high above the canopy.. I keep my 400 from 6-12 inches away... Get a thermo and put it at the same level as your canopy. Then you can dial the light height, in tune with the temps you want.. (try to stay under 80). You gotta try and remember that inside of two feet from the light source is optimal for lumens...