CMH supplemented with LED - what to expect in terms of PPF

What ppf or ppfd can i expect from 3x 315W CMH with 12 CXB3070 run @ 1400mA for a 2x1,1m Space?


I am in the process of planning a small grow room for legal CBD varieties. The height is limited to 2m. It’s an old Sauna that’s not in use and will convert it to flowering space. it’s 2x2x2m. Inside i have space for 2x1,10m and 1,38x0,7m for the plants.
I want to really push it regarding output, therefore:
-2 Layers Horizontally Stacked
-SOG Aeroponics with 150l/m2 Rootspace
-up to 1500ppfd with 1500ppm CO2

My main concerns are of course having not enough distance to the Light because of too much stretch and therefore stress and lightburn. I will counter that by short strains, correct or no veg time and negative DIF (nighttime Temperatures 1-2°C higher)

I will combat the heat problem by having active water cooling for the COB LEDs and power supplys. The CMH will run cooltubes with filtered air from outside.

From an old Project I have 6pcs 315W CMH Fixtures and 24pcs CXB3070 and also for these 24COBs Supplemental LED Starboards with 630 and 660nm Reds and Royal Blues and UV.

Now I really need some experts opinion on the correct Spacing / Layout and distances to the walls. (I will have reflecting Material on all sides.

so for the 2m x 1.10m I would have 3 CMH 315W and 12 CXB3070 (with HLG 185-1400) running at 50Watts each maximum.
Everything is dimmable.

I can drive 4 CXB3070 with one HLG185-1400. So my thought would be to make 3 (and 3 for the 2nd Floor) separate fixtures in order to be able to adjust the height of each one separately.

For the CXB3070 I have 120° and I think also 90° Glas Lenses to choose from.

From the layout perspective it will look like this (see attachment)

Can anyone help calculate the ideal distances for uniformity regarding ppfd?
Appreciate any help!


Attachments

With this kinda setup id probably just try it out and look what the plants reaction is. Its enough light i recon and you should defo retain dimming possibilites. We had good yields from 7 cmh of same wattage over 5x 1x1.1m trays. Cmh and leds mixed would likely fmgive you conditions to push harder than what your number calculated actually tells you, but you have more than plenty. Id guess 1000ish at max. Make sure your final setup is flexible enough for taking out your cmh in summer time and replace with some leds as that is going to get hot as soon as theres no cold winter air. Keep a sharp look at the grow until dialed in properly. And post some pics as this could be a real treat