30 Plant SOG w/ 2000 watt HPS

Area: 3'x3'
Height: 6'
Strain: White Widow
Grow method: DWC Hydro
Nutes: GH
Temps: 72 deg.
CO2: None

I bought a portable A/C to keep the grow room cool, but instead I'm use it to blow cool air under the two cool tubes. I tested it not too long ago and its cool to the touch. So I can pretty much get it close as I want.

1) How tall should I allow the clones to get before I flower them to yield anywhere between 1.5-2 oz. per plant?

2) With the cool tube being cool to the touch how close should I let them get to the plants?

Any advice would be appreciated.

For the record this is my 2nd grow, just 1st grow using HPS.

Anyone? I really appreciate it.

i THINK you can let the clones get two weeks of veg. so that they can make some roots them you throw them to 12/12. Flower for abou 7-9 weeks. takes clones from mothers at day 30 of the flowering 1 harvest. That way the clones will be ready to flower as sooon as u chop the 1st harvest and so on. Its called Sog.