Budro,........i love the airpots, so will you when you see the comparative outcome. Could you explain why you are using 59000 Lumen at 575 nm ?/..........when 620-650 nm is peak wavelength in flower (Fruitification) mode. Why do you not have a 450nm "peak" Vegetative grow light on the 17 plants, when in veg,..........??.....................you have 17 plants divide by 59k lumen = 5588 lumen output per plant, that enough, but in "Veg" 450nm wavelength HPS CMH ??..........
If you took 8 across the line in the 1.3m cab, you would yield more from 8 than 17. Factors of light distribution impact dramatically on yield. Environmental room between plants has a negative effect when to close to each other, same with to many rats in a box, they just wont grow the same as when thinned out, and environmental competition is reduced. 8 plants would share 59k lumen output, 7375 each plant, with penetration, which is important, light penetration is notoriously pore with HPS, unlike LED, as only 18% of light output is used by the plants. Just my opinion, thrown in as requested at start........AB............good luck with the grow Budro...........AB................