Just flower. I run 1 315 4200k CMH and 4 2700k 288's. Veg right now is just a SF1000. I'll be upgrading that light once the 10 x 12 shed is finished. more than likely with 8 or so low wattage HLG boards.
You said "HLG has exclusive access to the most efficient diodes Samsung has to offer, so whatever the deal, those kits will be using the brightest chips per watt on the planet"
Where did you get that information? What Samsung diode does HLG have exclusive access to that is more efficient than the LM301H?