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I'd go metal halide 400 w 6500k iwasaki mogal base bulbs check out marinedepot.com I'd use this set up would keep a large area warm and cover a good distance for plant growth http://www.marinedepot.com/ps_showCart.aspx?scType=add
You'd also be able to raise and lower it depending on temp and still have plenty of light to grow just about anything you ever wanted under it within a 4 foot by 4 foot area 36" plus under the lightgreat set up