best lighting for large grow

Upgrading my medical grow, need advice on lighting.
Ive divided half my pole barn for a grow.
The room will be 22×16. Its fully insulated and ive built an insulated subfloor. It has 100 amp service to a subpanel.
My current room that i will be leaving is setup with 5x600watt lights with cool tubes, with 2 4ft t5 btwn the hid lamps. Each lamp covers a 3x3 area. I grow 4 plants plants in a scrog under each lamp.
This has worked well for me but im not sure if i oughta use it for the bigger space.
Im planning on using air cooled reflectors with co2 and a 2 ton a/c unit dumping the hit air into a lung room.
Looking for advice on how to maximize yields in this large space. Should i increase to 1000 watt lamps? Should i continue to scrog or just grow larger untopped plants?
Ive rebuilt this barn by pouring a new foundation, new walls, insulation etc. Put about 10k into it. It was destroyed from water damage and a racoon infestation while my house was vacant for a few years b4 i bought it.
Now its time to start adding the lights and getting this grow fired up.
I can currently grow 36 plants but have the potetial for 72(in the future i could run the other half of the pole barn)

Id go with DE 1000 watters. They take it to the next level.

I would go with cfl's, strategically placed around each plant. Maybe 20 per plant.

I just watched a thread on another site where someone professionally built a large grow-op (100's of plants) and his rule-of-thumb is 4 plants per 1000 watt HPS.

Here's one of his veg rooms:

if you pick air cooled hoods, please connect them to ducts and move air through them. otherwise you are just wasting light placing glass in between your bulb and your plants like the picture above.

There's no glass in those fixtures. The entire room is climate controlled.

There's two ways of looking at keeping the glass in the hoods. First, there's up to a 7% loss of effective light when the glass is in place....but then again you can put your lights closer to make up for that loss.