I have grow space that is...2.5ftX2.5ftX4ft and i'm currently growing using two 4 bulb 2ft T5's and 4 24watt CFL's(stays around 75 degrees) and now what i'm wanting to do is move that set up and using it for clones/ nonflowering plants and i want to use a 150watt HPS but i'm worried about heat issues. I have a fan moving air around...but i'm wondering if anyone has an educated guess on what kind of temps i might be looking at in this small area.

Its just in a closet with a door i leave cracked. There is other stuff in the closet but i use a corner for growing. i only grow like two/three plants at a time...