Your plant looks good mate, I mean healthy. You got only one 13w CFL in there or multiple? If it's the case of only one, you will need a couple more when going to flower, because your plant will grow some more and I'm guessing you'll be wanting to pick up a few buds for a couple weeks worth of smoking. If you don't invest in lights, you won't get very good results...might be satisfying, but not great. Closing the walls in is recommended, to make better use of the lights (will reflect back from the walls and to the plant).
You've got an indica there, so it's to be expected that your leaves are more tightly packed. This can only be good, trust me it's a freakin' nightmare growing sativas under CFL's. They stretch like hell. Also this means that you'll most likely get one huge cola. For the next grow, I recommend you looking into LST and/or topping + scrog. If you have the energy and the cash for a bit more equipment [and fun] that is
Well, that's about it, forget about the light not being enough thing, I've grown my 2 pretty big plants (about 1m high one of them and about 0.8m the other one) for a couple of weeks under just 7 CFL's (3 of which were 6400K) and they weren't dying because of the lights. Surely, they weren't very promising yield wise, but that doesn't mean the plants aren't healthy. Light not being enough usually makes the plant fall to the ground (after it has stretched for the light), and not being able to support its own weight. You don't seem to be experiencing neither stretching [lack of light] nor lack of vigor. I'd say you're doing very good. Congrats.
How old is your plant? Preflowers usually appear 3-5 weeks after sprouting, but I agree those look like pistils. When you going to 12/12?
