Right now I have two four foot shop lights. Each shop light has a daylight 6500K (Daylight, more towards blue spectrum) and one warmer bulb (4500K), the mixing of the two bulbs seems to do well, I once had both bulbs at 6500K color temp, but some many people have told me to mix a warm bulb with a blue bulb, for more of a full spectrum. There are also full spectrum bulbs you can get, which I have never used. I would say sick to daylight 6500K bluish bulbs because this encourages green plant growth, while warmer bulbs encourage blossoms, but you wont really need warm bulbs if you are eventually going to plant them outside. Oh and also, put up some Mylar/aluminum foil on your walls just beneath the light to reflect the light back towards the plants.
Why buy produce when you can grow it?