Okay so after some extensive research not to mention some testing of my own I think I'm caving in to getting some HID's. I plan to set it up in my basement which is probably about a 20x12-15 (roughly) room. I'm thinking of having an 8x8 area to grow my plants with 4-400w HID MH/HPS Convertible lights. Is this overkill? With the room that big would I need to find a way to keep the room cool by buying anything? I imagine in the winter time I'll need a space heater for when the lights are off although the furnace is down there as well.

Thoughts? Concerns? Questions? Although the cost to setup will be somewhat high I plan to purchase one thing at a time and when everything is all together set it up. Any help is appreciated in what I should do. Thanks!