Thanks for all the input guys. It has been helpful!
I would like to clarify, that the service recommended by the power company is a 120/208/240v 3 phase high-leg delta configuration.
The bulk of the loads are lighting and HVAC. The lighting is rated for 120-277v single phase (switch mode powered LEDs), and the HVAC is rated for 208-240v single phase (inverter powered compressors).
The big question for me now: Will my equipment designed for 240v single phase power operate correctly on this 240v 3 phase system? The voltages will all be in spec, but the guy from the power company did mention that the phase angle between L1 and L2 supplied to the devices being at 120 degrees instead of 180 degrees like they were designed for could potentially cause issues, but he did not know for sure. I have read many topics on the issue and it seems most people say it will work fine, but some say it will cause problems. The manufacturers (or their support at least) seem to have no idea what I am talking about when I say 240v 3 phase high-leg delta..
Sure theoretically I could just run everything from 208v, but I would rather not as it seems less efficient, and also I already have TONS of 120/240 double pole breakers (208v to ground requires a specially rated breaker I think), as well as regular 120/240 panels. If possible I would prefer to ignore the 208v entirely and only go with 120/240. Barely any loads at all will be 120v, such as some small fans and backup lighting.
Yes, that is what I originally intended to get installed.
The guy that said the service would require a single disconnect is the boss of the engineers for my local area, so if he is incorrect about that I don't know what to do about that
The dimensions of the warehouse are 43x60. Yes, it is a large grow room. I listed the types of load above in this post.
My lighting does support 277v, but we are going with smaller AC units because the building is segregated into sealed rooms to prevent cross contamination.
Thanks for the suggestions!!