This is an awesome grow man, ive done a few small ones, I am setting up a real grow soon and I hope it will be do as good as yours. Looking at your room and the amount of ventilation, were you planning to add lights the whole time or were you hoping to grow with just the 600s? also what is your nute schedule/ dosage like?
I would use his word as a guide but with as much invested as your grow is you ought to buy a microscope, or even just some strong magnifying glasses, 40 to 60x should work.
you look at the individual trichromes towards the light and they will be clear for a few weeks, then slowly get cloudy, then they will turn milky white, then eventually a dark amber. if you harvest while they are clear you will get a super sativa high, you will feel like getting up and doing shit, if you wait until they are amber you will have an indica buzz, you get paralyzed stoned, great for medications and, they grow just a little bigger.
once again man, nice nice work, this is an AWESOME first grow!
