You could probably get 3 plants worth of light for a little bit over $100 if you use mixed spectrum cfl through the whole grow so you don't need two sets of lights. I would suggest getting three 125watt cfls (Real watts not equivalent), one 2700k one 5500k and one 6500k. The lights are $25-30 each on amazon. I would also get three 10.5 inch clamp reflectors for them, they are $13 on amazon and they have ceramic sockets that will easily deal with the lights, and with some positioning and reflective backing (Mylar, b/w poly, etc.) you should have enough lumens for 3 plants through both cycles.