I disagree on using CFL's...perhaps for the first grow, as a learning excercise...but you will be disappointed with your results, I guarantee you that...its fine to veg with CFLs but if you flower with them, the potency, density and total weight will be lacking (especially with low wattage CFLs like 23w). If you want good results, go with an HPS lamp for flowering (or induction lamp with supplemental LEDs if you can afford it). If you get a digital ballast for your HPS (which I highly recommend) you can adjust the amount of electricity it uses with a built-in switch. Also, cover the inside of your growspace with mylar (preferably diamond print). Also, you should take a look at grow tents on ebay...a small growtent should cost about the same or less than the materials for a similar sized growspace. It will save you a lot of time and effort, last longer and is probably easier to set up and put away. You will also need an exhaust fan to get rid of the heat from the lamp...or better yet, a cooltube with an inline fan...then you can bring your light a lot closer to your plants without burning them. Finally, use a SCROG. One that's attached to the pot (oh, and use the biggest container you can get your hands on as a pot...like a nice 30 liter storage crate...and use only high quality organic soil...might as well go all out if it's just one plant) so you can still move the plant and take down your setup temporarily, in case of visitors or whatever...