Don't get how 4 315s is better coverage.I would go for 4 315w just to get a bit better coverage. Or 2 315w CMH & 2 240-320w LED’s.
I just don’t like the dual bulb design. It’s not air cooled and forces to hang higher above canopy wasting light and since it’s a tent OP is most likely limited on height. The benefits of CMH to me is being able to hang them close to the canopy.Don't get how 4 315s is better coverage.
Each covers a max of 3x3 and that's pushing it. No orientation that covers a 4x8 with good light distribution.
6x6 or 3x12 but not 4x8