Help with lighting heat

Hi guys. I am planning on growing one or two plants in my closet, which is 3 square feet and about 5 ft high. I was wondering if I buy a 150 watt HPS lamp, about how many degrees would the temperature rise in the closet?

with the door open you should be fine but when it comes time to veg your gonna need a light leak free area and will have to close it off so the temps will soar. Grap yourself a oscillating fan, and take a peek at a few posts about ventilation in the grow faq.

Oh and sweet tagname lol

I would also add to keep your ballast out of the closet and just hang the light in there. I'm running a 400w HPS in a 3'x7' closet for vegging and can keep the door closed without the temps or humidity going crazy (~~82F & 30% humidity).

You should be fine as far as temp. Just wach out for burns in such a short closet, but 150w should be ok. I got pretty much the same space.