you could but if they have more than one internode (which they do) you will get lots of side branching. and four plants under 200W of cfl's two being topped is not going to produce much due to lac of lighting. @ 4 weeks you stalks should be alot thicker. When you say you have 200W of cfl's what exactly do you have?
From reading all these replys, it really seem like people discriminate CFL's quite heavily right? But what this guy said is absolutely true. Seriously.
But in all honesty here, you're just wasting our time. If you think you're so right about how you did a grow w/o fertilizers and it turned out fine and how you are gonna use cheap fucking CFL's and say it's close in wattage as HID's; so it's almost as effective and all that then go ahead. But these people have done that like you did, then evolved into better things and then they mastered it completely. But do you realize what you are asking? You are asking some of the most basic questions, 101 of cannabis cultivating if you will; and people give you great advice and you're like "na that's not true, I do what i want."
People say: In order to accomplish *THIS* on *A*, you should consider *B* first.
YOU SAY: I don't care about B, so can I just do it or not?
MY ANSWER: You can start off a seedling from 12/12 photo period if you want, YOU CAN TOP any plant at any stage if you want.
(if you are smart)THEN YOU SHOULD SAY: COOL, TY. BUT DO YOU RECOMMEND IT?
BUT YOU'RE REALLY SAYING IS: NO, my cheaply made ghetto setup will be fine, regardless of what you say, I'm keeping what I got and I don't care what you say.
So I'm like WTF??
Truth is, certain strain takes topping better than others and certain strains really fuck it up if you do that.
Are you one of those people that takes on a new hobby or w/e and then do everything half ass and then quit half way too? CFL's, MG soils, No Nutes.
I see that you're off to a great start. Good luck.
I know I'm coming off as an asshole right now, but if you are serious about this and want to do it the right way by taking our advice, then feel free to send me a PM anytime. I'll be more than happy to help you.
PS: Don't be a bitch and start getting all EMO about this. This isn't a trolling discussion. Our intention is to only help you and set you on the right path, and I DID answer your questions.