Since they're used to the real thing, make sure they get lots of light and fresh air. They might show signs of stress, but don't try to fix it by over watering or over fertilizing. And you'll have to check them for bugs before you have and outbreak chances are they have some after being outdoors.

I'm just speaking from reading the forums, not actually practicing. But I remember that it also depends on your setup, what gear you're using to grow, where you place your lights, how big the plants are, etc.,.