I went from 3x600 (1800w) hps air cooled to 4x 315cmh (1260w), and pulled the same weight, but more frost.
There were 2x OG's (hammerhead and reeves(iirc)) on icmag (iirc) back when the cmh began to gain popularity. I followed those 2, then started my own tweaks. At the time, Philip's bulbs reigned THE best out of every other bulb maker, with the exception of ushio. Ushio beat Philip's by 2umol of uvb. That's it.
I've done testing with a/c hoods, no glass hoods, co2, no co2, flowering with a veg bulb, vegging with a flower bulb. I have TONS of trials I did over at thc(scammer). Same screen name.