Plus, I'm a fan of quick cultivation, I grow in SOG giving 2-3 weeks of growth with a lighting schedule of 20/04. And now in my new box, I plan to put 9 pots of 7L. And often dominant indica, like the strain that makes me smile right now, Gelato.
SOG is the best option in term of gr/W/m²/"weeks spent veg+flo"
i have a similar set up: SOG 8 plants 6Lpots 60x90x180 250W HPS, i switch to flowering after 2 to 4 (most of the time 3) weeks veg depending strains.
I have an 80/80 box with VIPARSPECTRA P1000 LED panels. And 2 TS 600 that I use during flowering because the light is a bit warmer than the VIPARSPECTRA. I use the entire range of Canna Bio nutrients.