I posted some of this and have told you before. I ran 3 cuttings each from 3 known mother’s 3 times in each configuration. Then pulled the 315 out for the summer to be sure of any results I got earlier. The hps grew more potent and less leafy buds. It is Hortilux super hps so there is some added needed blue light in their spectrum. The 315 as supplemental helps with compactness some strains shorter ripening times and much more colorful leaves likely due to the fuller spectrum. The 600w Hortilux blue out grows the cmh 315 too. But even looser leafier buds. I think that it is easier to achieve potential with the cmh than the harder to dial in hps. The plants like less intensity during ripening in my opinion so I back the mature buds away to retain terpenes and help the buds keep growing with less light stress.