these guys are only partially right....you can easily grow a plant maturity with 69 watts, and depending on how you place them, you can even have a decent yeild, 3 23 watt cfls will put out almost 1000 more lumens than a single 69 watt cfl, and since more tubing will actually be directly facing the plants, you will have even more usueable light hitting the foliage, although more light would definately be better, you should have no problem getting decent smoke from 69 watts. hell ive seen a plant grown under a single 23 watt in an 18 oz dixie cup that yeilded 4 1/2 g's dry, and was only 6 inches tall, may not be a high yeild, but was FOR SURE some dank ass smoke, if you can only use the 69 watts, just use a small pot and it will keep your plant small, and you will have no priblem lighting the entire canopy,
i may be using like 300 wats of cfls in my grow, but that dont mean i need it all, its just the more the better ya dig?