We’re making it more technical than it needs to be. You will understand this way better.
If light A has higher efficacy(energy per watt) and a light spectrum with a higher rate of photosynthetic efficiency, and compared it to a light B that has lower efficacy and a spectrum that’s not as photosynthetically efficient, at the exact same power level, how would you expect the results to end up?
Not to say it will be a landslide or anything like that. But it’s a little ways from a fair comparison. If we put @MattyBear’s light against the 315 you could see what would win between efficacy and spectrum, and it pulls 60 Watts less. Or half of @Covertgrower’s light. Has more similar color rendering index and slightly lower efficacy. Either way, at least one aspect in each case would be in the same neighborhood.
Donaldj is light years beyond anything I’ll ever do as a grower, and I’ve already learned a ton from him. Do whatever he does and however he does it only really needs to make sense to him. I just wanted to point out that the 315 cmh has a pretty clear advantage in this case. Nobody ever accused good leds of being cheap.