good luck with everything bro
overhead lighting is great, but I cant picture a flat garden plant producing more than 8oz total of quality, so your yeild might not be what you imagen, but 6k over head is easy to deal with cooling wise
on a side note about the UC, take it from me and northone, after a yr in RDWC mpb's I would never suggest a UC or a MPB to anyone, there is not plus side to these types of systems IMO, only quicker vegging. going from yeilding 10lbs to not yeilding 10lbs happens overnight. if you look around youll see more and more root rot popping up with the UC, others wont admit it. Even Jack had to take down a 16site last run but he didnt talk to much about it.
everything goes up with RDWC, electric bill, nutes, water bill, paranoia, risk.