I run 315's mate, would never ever use anything else. Square wave ballast, 94% CRI, high umol too. Paps are decent lamps, had one for about 2 years now, the d-pap 315. I am currently running a test lamp from Nova 600W MH but its hotter than the sun. my plants look great tho, really stocky.
main tents are all running 2x 315W hoods one lamp is daylight the other argo.
I would never use a LED, cant be arsed to save on the lamp watts and loss on the heating I would need to get my plants to grow properly. Yeah in the summer they might be ok, but now its like 3c fuck that. heaters are pricey to keep running versus a lamp imo.
The other benefit of CDM besides yield over LEDS, they run a bit cooler than HPS, only a degree cooler but bear in mind this is a 630W set up compared to a 600W HPS for example.
if you are buying a lamp, buy a CDM 315 mate, no questions this is the best lamp i have ever run. And I have run them all, people that know me know I have tested for pretty much evertyone. My personal choice is this