i have 2k in lights inside cool tubes with a 750 cfm fan cooling them, they are inline of eachother, how close do you think i can keep them to the tops of the plants?
I use 1k bare bulbs and have plants within 8 inches of the bulbs. I suppose it depends on your equipments ability to cool. I pay for lumens, I want to use as many of them as I can. Peace GS