Lindsey - if you want to keep your expense minimal, you could look into fluorescent shop lights. They come in 2 ft or 4ft lengths and most will accommodate two fluorescent bulbs. They usually come with chains for hanging. When buying bulbs, get the highest lumens rating you can afford. The tops of plants can be within a couple of inches of a fluorescent bulb without burning. But the bulbs often need to be quite close to the plants. The lights should be on for around 16 hours per day minimum. You could check out the houseplants forum for additional information on lighting.
