Imo he should try it and see how it turns out. It's a small investment since CFL's are dirt cheap and 2700k flowering cfl's are even dirt cheaper. But just to throw it out there, there are hundreds of grow journal posts made by people in this forums that you can check out to see how theirs turned out instead.
But all in all, if you're considering on getting a tent, then it would be much easier for you if you just get HPS and get the cooling you need along with a carbon filter for odor control (Which all connects together from start to finish).
All I'm saying is that the products you see on the market today has been revised for many years now and I don't see why you're trying to go off on your own way in a ghetto budget kinda way.
Another thing to point out is that it takes like good 4 months to get a product from start to --> finish. Some even longer. You gotta water it ever couple of days and it does take a little amount of work. But in the end, don't short yourself out because you wanna go the cheap way.
But like I said though, CFL's are cheap and even if you want to try it out, it's really not a bad investment. But you'll never see a dry nugget (cola) that weighs over an oz. dry or even close to it with CFL's.