I think those would work just fine. That looks awesome man! I will just be using the HLG heat sinks, and you did a great job.
I'm thinking of going 5 across, 2x2Qb648 with another 1xQB648 right in the middle using the existing 120-54A I have for both the Bspec and the 648. Of course, nothing is in stock. I would also put a few T5 UVs along each side of the row of lights to make it. I wonder if two staggered 24" ones would work because two four footers seems like overkill in this space.
It looks like the fV range for the 120-54A is within both types of board operating parameters and can be adjusted with the V pot....although, that would only give me a few inches clearance from the walls on each side (600mm+340mm+600mm=1540, I've got about 1700mm space across to work with, so that's inches on each side from the walls). Running five at 100 watts each instead of 4 at 125 to achieve about 36w/sqf(I've got just under 14sqf).I'm not sure if running each board at 125-130 would be a good long-term idea. I am remote mounting the drivers outside of the room. I have a 240CFM register dual fan I installed in a vent at the very top of the closet which vents it to the coldest room in the house. I am hoping this will be adequate for a 110 cubic foot room.
Anyway, what do you guys think?