I'm looking around at upgrading my current CFL grow for flowering. Hoping I will have 2-4 plants of Nirvana Citral in a portable standalone closet, 3ft x 2ft x 5ft. Looking between a HTG 400w HPS with built in ballast, a 400w external ballast or a 250w either/or. I am of course trying to do this as cheap as possible, don't expect any payback other than personal for my efforts and don't have any extra money to spend really. Growing soil with fox farms ocean and fox farms 3pack family of nutes. I'd like a cheap 400w w/ built in but I think it will make too much heat to dissapate with a just venting and strategically placed oscillating fans. Would the separate ballast work or should I just drop to 250w or will I even need more cooling there.. Ambient temp stays around 72F currently. Any help appreciated. Will also take cooling ideas from anyone. I've never used an HPS lamp so I just don't have a clue how much heat will be produced.