In my humble opinion, When you have done 12/12 for 7 weeks, it is time to think about harvesting, but never before 8 weeks. It looks like all of your stamens (hairs) are still very white so it is not time yet. When yu see some stamens change color,that is when you get your $9.99 Radio Shack lighted hand-held microscope and start looking at trichomes. ( go to HARVESTING at GROWFAQ at the top left of this page)
when you see some red stamens and some Amber colored (beer color) trichomes, it is real near time. Then FLUSH at least two days, and also consider putting them in total darkness for 48 hours.
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