Question - Expected Yield on my Setup (NEW)

Bob has this setup his going to try!

Organic Soil Grow.
25 ft by 30 ft.
24/0 first 3 weeks
20/4 last 7 or so weeks.
Mylar will be used all over the place.


120 Plants in Soil Bags
4 x 600W HPS -Digital Ballast
4 x 600W MH - Digital Ballast
Large 8" blower out / and x1 intake
------------------------------
Great Quality Organic Medium
Fox Farms Ocean - Mix
Black Gold brand Rose and Flower
Some other Bloom / Root Neurts

I'm thinking about tieing down weight to branchs/cutting bottom leafs.

Seeds: Autoflowering mi5 and maybe sour 60? If I can find it.

==================

What can I expect a yield to be?
Any opinions on changing anything?
Should I use Co2? -- I'm sacred about danger it imposes possibly

Thanks alot guys!

why would you want to grow auto flower? the yield is smaller and less potent and you would run those hid's under 24/0 which is a big waste of electricity. also if you start with seeds your plants tops are most all going to have a different height and grow speed. yield is determined mostly by your grow knowledge and depends on the capability of the strain your growing. i would do a small grow and practice. wouldn't you be scared to toss all that dirt since your so paranoid just to say "im growing" instead of "bob"?