As far as the lights go, I'd highly reconsider any recommendation for CFL's. They're low in wattage, yes, but they're also low with their life-hours. Only worse choice would be incandescent. There's also something to be said for the quality of light.
Anyone pushing a certain light type based on the Kelvin temperature or the lumen output needs to be questioned hardily. Science has proven long ago, it's not the quantity of light (lumens), it's the quality of light (Photosynthetically Active Radiation, or PAR). Different types of crops have varying "optimal nanometers level" on the spectral range, but typically speaking, you're looking for the reds with a little bit of blue. This is a large reason why HID's have been such a go-to cornerstone in the marijuana lighting world. Although not the most efficient light-source, they have a long-life and offer up the colors your plant craves. You can dump any assload of lumens on a plant with little to no success if you're not feeding it the spectrum it needs to grow.
But like I said before, all I know are lights. That's just one piece of the puzzle. You have a little more room for wriggle when you're growing on a 4' square tent as opposed to 22,000 sqft. warehouse. For your tent, I imagine a 250w HPS should be sufficient. Another option is to get one of those Electronic HID ballasts that is 'adjustable'. Traditionally, an HPS lamp was only good with a ballast for that specific wattage. With these newer electronic ballasts, they come with a dial that lets you adjust for different wattages on your lamps. So if 250w wasn't sufficient, you could exchange the lamp to 400w, turn the dial up to 400w, and not be out anything else. The ones I've seen typically go up to 1000w, but that's more than you'd want in your tight of a space. Remember that the physical heat of the lamps goes up quite drastically as you increase wattages, and that can be damaging to your end-product.