easy isiquel, what light systems you using, im using a 75W flourescent bulb on 6 plants and my stems are thin as shit, only 3 and a half weeks in, im keeping them next to the window to keep air circulation now as it helps the stems strengthen which is what I suggest you should do, btw northern lights is a fantastic strain apparently, ive had many friends tell me that its really adapted to indoor growing and the high is real good. about the space, I think you should take them to the garden in about march if you can as the weather is getting warmer and i think the sun and wind may benefit your plants, thats all the info i can give as a noob grower, but hopefully you should get a good yeild cause your plants are doing pretty well under a really low light system.

peace