It would do the job...what if i got a 250w?
the thing is i dont plan on going any bigger than that and i would imagine a 400w would be a little hard to manage the heat.yea a 400w dimmable would set you off fine. 400w straight might be alot of heat for a 2x2x5 but you can work it down with the dimmable and use the full 400w if you upgrade the room size.