This is my first grow, I will be switching these girls to t5 tomorrow. Should I be concerned by their height? They will also be going outside into a greenhouse after 2 weeks inside.
You'll get stretch with cfls unless there within a couple inches of the plant. Useful light range with t5 is a little better but they can still be pulled in pretty close unless it's a pretty hot 12 bulb setup.
They are stretching, but you’re changing the light so they should be fine. If they fall over in the meantime you can bury the stem further to stand them up ☺️