Grow area is 28"x 19"=3.69ft^2 I have a 400 Watt MH sitting about 3 feet from the canopy. I also have an AC unit which can bring the temps all the way down to 64F in the daytime if needed. If I can keep temps this low with a 400W, can I swap out for a 1000W dual arc to dramatically increase the yield? I'm hearing that 15,000 lumens per square foot is the limit, but is that true if I can keep the temps in check(I plan for about 77F)? A 100,000 lumen dual arc bulb will create 27000 lumens/ft^2. Will bleaching happen even if the temps are ok? I know this is a ridiculously small grow area for such a large bulb, but I'm looking for the densest nugs in existance, and this seems like the way to do it.