air cooled reflectors and you'll be just fine, don't understand the 2 400's in one 2x4 room, one 400 is enough for a room that size but if you can cool it 2 is always better than one. 1 600 would be better imo. How do you have 2 lamps on a light mover in a 4x2 space is my question, where are they moving not much extra space when you only have 4' to deal with, I wouldn't waste my time or money with that. It does sound like you have a very nice setup so far though. Keep us updated and get that pic up.