because right now my 3x3 mylar covered closet of happiness is at 180k lumens, or 20,000 lumens/sqft.. heat isn't a problem, plenty of air moving, I just want to be sure that being under the equivalent of two suns isn't somehow a bad idea..
The only issue I've heard of is if your lights are to close it can burn your plants. Not from ther heat.Although can happen of course.Somehow the inside of the leaf can burn from the nutrients,or something to that effect.