The best is actually to mix the MH/HPS for a fuller spectrum or in your case have the flourescents with the hps, although I use MH solely for vegging and switch to HP for 12/12. Contrary to most people I like to veg for a long time, about 12 wks, but Im not limited by space so I know not everyone has that option. Just from looking at the pictures I personally would keep them vegging for awhile, but thats all dependent upon your situation and I dont want to say any specific time cause thats up to you. Good luck, take care.