I'm running a 430W in a very compact stealth setup and it's working great. You are looking at lights that are not 'remote ballast'. You NEED a remote ballast with a batwing reflector and/or cool tube for small spaces. The cool tube would probably be the better choice IMO. Either way you need to have just the lamp in the growspace with the ballast hidden elsewhere. Flos are good yes, but they are not going to give you the yeild I'm sure you are looking for when all's said and done.