you'll probably be fine.. i don;t know what kind of heat output a 150w hps has, but i can;t imagine its all that bad.

just make sure you have exhaust fans - don';t bother with in-take fans, just use passive intake holes, the exhaust fans will pull the air through fine
syde00 Reviewed by syde00 on . quick noob ? Noob here! With one really quick question. I have already searched for the answer with no results. I'm a pretty resourceful guy and have done a lot of homework, but can't seem to find the answer to this question. I can go to the local grow shop to ask, but I'm bored at work and thought I'd post here to see if anyone has any insight. So.... We are going to start growing in a Homebox XS. Here it is if you want to see. The dims are 2x2x4. This is the light I would like to use. It has Rating: 5