My setup is forever changing and I don't use a 600w bulb, so not sure my info would help.
I've run probably 20 strains, veg time from 0 days to 8 weeks, Dutch master nutes, scrog for sure, hydro most of the time, DWC/ flooded tubes/ buckets, horizontal and vertically mounted lights. 250w, 400w, 1000w HID's, LED panels, harvests have ranged from 1 oz to 20 oz, all from my 2' x 3' closet. Mostly from clone, but also run from seed.
So basically I'm all over the map. Good luck.
EDIT: I'm definitely not a pro