Hey bro, maybe you should think of changing to a 250w HPS, take a look at mine here
http://boards.cannabis.com/closet-ca...ml#post1512807
Actually, it is the same 'size' of the 400w, what i mean is that the 'plug' where you conect the 400w is the same for the 250w, cover your place with a lot of reflective material, the advantage is a lower light demand, plus you control easier your temp. Is a matter of space, if you have a confined space like me - I do live at apartment just like you - it is ok, but if you have a larger area, than you should go to the 400w lamp