I'm pretty impressed at the rate these babies are growing. Today is day 1 under the 600w, they were under 180w led to start. So we'll see how they grow now. Is 15 inches above the seedlings to high/low? Let me know please
Looking really good and as long as they do keep doing what your doing. As for light distance just keep watch they dont stretch too early as you want to keep nodes nice and tight through veg and later during flower you can let em stretch a bit. All that is dependent on light distance. When you transplant I would bury them as close to cotyledon as possible. Just a thought