sorry another light ques, I have a small grow room planned 4ftw 4ftw 6fth I have 2 400w lights I know heat will be a prob but if it can be controlled will 2 400w lights be better than 1 for flowering up until now 2 years I have grown outside but now want quicker seed to harvest times so moving indoors the room I am using is a 6ft by 4 shed I plan to use a small part for veg