I finally broke down and swapped out the 600 HPS for an LED board and am now fully LED. This panel is a Mars Hydro TSW2000 with the older Samsung diodes with a few reds. It's only a 300 watt board using dual 150w drivers, but I had to turn them way down b/c the drivers got really hot. I mounted them outside the room to make accessing the embedded turn pots doable. It's only rated for 3x3 in bloom, but I bet they never imagined it being circled with 16 Vero 29 COBs, so pretty much anything I put in the middle should do fine. I just needed to nix the heat the HPS was creating and now it'll stay nice and cool in there during lights on. I'm still rotating the same strains in the same soil for all of 2020, but will likely ditch the purple and the cookies b/c their yield is lame, but the other 3 yield well. My yields are way up and my overhead now is way low. I'm relentlessly recycling the peat, mixing my own custom ala Megacrop inspired sauce and more gains can be made going forward. I also tried my luck with some veggies out in the yard so it should be a fun summer assuming the country doesn't rip itself apart in the meantime.