I am a small space grower so not a lot of help when it comes to scaling up to larger space. However, another referral besides AgVet is @420qc. He moved from tents to a larger grow room and I believe uses 650r s. You can check it out the new room at post 4391st grow journal for 420qc
Another large space fixture is the HLG Scorpion Diablo.
Budget LED also has some interesting options. A new offering is the Demon. Similar output as the Diablo but requires more height clearance.
The space looks awesome.
As for dealing with clones, I went a different direction. I packed 12 into a 24x18 space to see how SOG works out
It is going to get interesting real soon (I usually grow a single auto in this space)
This photo shows why I am looking at fixtures with a square footprint