Overall yeah. They look good. Instead of a HPS400, why don't you switch to an air-cooled hood, and get the ballast out of the room if you haven't already. As comparison, I've got 2000w in a 6x6x6 cube with air cooled hoods. You can get a lot of light in a little space if you run a high CFM blower, at least 200CFM, cooling your lights and exhausting that air out.