I went with 6 Vero 18s and I'm gonna run them with an hlg-185h-c1050a meanwell. For the spectrum i chose 4 3000k and 2 4000k.
The reason I chose the Veros was simply cost. They were much cheaper than the 3070s i was also considering.
If i was going to build another lamp right now, I'd go with the citizen clu046 ver 4 1812 4000k 80cri. It would either be that ot the 1818 and just run it at 1050 for better efficiency. Either way I, personally, just don't see the point of going over 50w sq/ft. Yes I know cobs big thing is efficiency, but to me getting a better spread and much more even light intensity through out the grow area on top of the efficiency is what sets cobs apart.