Yep, that's gonna be a lot of heat in that space...you really only need one 400 if your gonna do 3 plants and it will be more than enough. Got another closet? You have the info in the Jorge stuff...take the time to read all of it and then just dive in. Everybody's got their own style and you just have to find what works for you...there's more than one right way to grow this stuff, so it becomes more of a "what suits me" kinda thing. Read read and then watch the DVD's! And make it fun...it's a good thing your doing!