I am starting a new Aeroponics grow 1st time with this system. It looks like I can let my girls grow to approximately 40 inches and maintain about 1 ft. clearance from light. I am growing Lambs breath(lambsbread), Green Crack, Hash Breath, and Blueberry. 3 of each. My question is how tall should I let them get before switching to 12-12? I know these may not be compatable strains, but kinda forced to use them as they were the only ones I had enough of to fill my system. ( Stinkbud's system)