cfl heat vs hid heat

i want to use an hid in a space where i have previously used floro light. Its a closet 5' x 2.5' with an 8 ft ceiling. what i did was attatch a 330 watt t5 panel off a shelf about the hight of the bar where you would hang clothes, basically about 5.5 feet from the floor. all arround the plants i had y sockets with 50 actual watt bulbs on each side. i ended up with around 600 actual watts of light and in the summer it got real hot. finally i solved the heat problem by cracking the door about 6 inches and strategically placing fans to both hit the plants and exhaust air out the crack. my question is this: if i got a 400w hps in this same space, would i be able to get away with venting the light out the same crack and just having the same general fan setup as before? its about 200 less actual watts of light, but less spread out. in the pics the door isnt really cracked that much but you get the idea. the honeywell fan points out the closet thru the crack like an exhaust, and the other fans inside force the air toward the honeywell fan. am i just a big moron? go easy on me

watts = heat

Yeah you should be doing better with the heat with lower wattage.
Just be aware that your heat distribution changes. You may get some plants too hot close to the light unless you have a lot of circulation.

Thanks. i figure if i could get the temps to the low 80s before with all those watts i should be all set with just a 400w hps. another question: can i just run the ducting from the light out the door or should it be propelled by some kind of fan itself? do they make reflectors and light housing units with fans in them already? i am scared to death of hid lights with all of their peices and crap which is why i started with the floros but i want to see how much i can increase my yield.