As someone else mentioned - cooling the area is a simple task of taking the hot air out (at the top of the closet) and allowing cooler air in via vent holes at the bottom of the closet.

This is only a suggestion as I don't know your situation. Is there anyway you can take the door off the closet and replace it with something you can install a fan into and some vent holes?

You can't just shut the door on the closet and leave it anyway regardless of the heat build up - you need to replace the c02 rich air around the plants regularly by more c02 rich air otherwise they won't grow very well. So you need a method of replacing that c02 spent air around the plants as well as extracting the hot air so a fan of some form and venting is the only solution.

Yes it is Over Kill and the wrong spectrum to get them out of the ground and veged with the HPS (2100Kelvin-Warm light for Budding), check these out 26 Watt Compact Fluorescents Light Bulb they are cheap ($3.27) the right spectrum (6400Kelvin-Daylight for groth) and suffeciant for a few plants. Just use 1 per plant or two so, and keep it close, it is also sugested to use a Warm light as well during veg 1 per 3 plants or better.

Also dont go overkill on the floresents about 150-200W worth will be more than enough to start plants that will fit in your room. This is about 6 bulbs with 10,000 lumes total (Lumes-lights intinsity), your 250W HPS is about 26,000 lumes.

__________________
-=4:20=-Guys links:!HARVEST! Purple Kush (link right to harvest pics) : My Room : Power Consumption / Light Cost

am frm the U.K so cant use that site. is that what il need then, cfl's to start wit and use my hps when they are bigger and stronger? cheers for the help lads and if any1 frm u.k knows where 2get cheap cfl's please...HOLLA AT YA BOI lol

screwfix direct do a decent range of compact fluoros, thats were i got mine from anyway