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Great work so far, Indicantonio. I started reading the thread because I too am about to drop some serious scrill on a DR II 120 & Lumatek 600W. Heat issue was one of my main concerns regarding whether to get a 600 or 1k lamp, but I figure if I can get the idealistic 1g/W that is more than enough for my personal stash. Anywho, enough about me.
I would say definitely move the 4" inline over to the veg chamber; passive intake should be more than enough in your flowering chamber.
As far as how much longer til you get some gratifying buds: 2 weeks. How much longer til they're ready: 4ish weeks. As far as how you "will just know"...
1. Trichomes form along every crevasse of the plant (sugar leaves, fan leaves, calyxes, even on the stem!).
2. Trichomes go from clear, to cloudy, to amber. I prefer a 50/50 cloudy/amber mix, but to each their own. Do a little research and find what suits your taste.
3. The buds themselves begin to have a golden/silver glow to them (this is due to the massive amounts of trichomes that are amassing themselves over a small surface area, hence even from a distance they nearly glimmer)
4. The fan leaves may start to die off in the last couple weeks, usually exhibited at first as a nutrient deficiency.
Well, I'm here for the long haul, can't wait for an update.
The 4" will do just fine, I use a cheap duct booster in my veg box and it keeps relatively cool, also with t5's.
My tent is cooled by passive air intake/ambient room temps.
Last time I germed out of Roots Organic - original 5 for 5 hatched, 3 of them broke ground in 3 days, the other one was a straggler and I didn't think it was going to hatch so I stuck another seed in there, that seed hatched in 3 days, then a week later there was another baby growing under the 1 week old sprout.
So they all hatched, just one of them took longer than I thought it would, the late hatchling turned out to be a male anyways.
let the trichomes tell you if shes ready.