lol our setups are going to be very similar!!! Also you should be fine with a single 400, my 75 is a four footer, and I have my hqi in the middle. It lights up the middle out to the edges farther than I thought it would. I kinda like the fade in the corners. I have three t5 lights in my canopy so it's not all dark there. Gotta buy the rest of my stuff before I get another mini pendant. Can't wait till we're both up and trading!