My auto's are 2 weeks old there about 7 inches showing 3 nodes. They are in 9l pots. I've started them on veg nutes. My MH light is about 2 ft above. They are on 24 h light cycle. I want to switch them but was wondering if I should hold off for another week and maybe stretch them abit more. Aparrently they are designed to go between 600mm to 1.m They don't look like they will go to 1m if you use the x3 size after switching to hps. Any ideas?