Hey man, I completely agree with you about the advantages of this wattage. In a tent your size it's ideal. I'm about to run a 400w (sunpulse range and digi ballast) tent grow myself. I like it you've been thoughtful about that because a lot of people would have thrown a 600w in there and be struggling with temps and bleaching etc now - although it looks like you have good height in your space there. Have you used shooting powder before? Buckle up. Along with roots excel I reckon it's one of the best additives from H&G.