I have a swimming pool in back I throw the plants in there, let them sink to the bottom and let the neighbor kids fish them out for me.
You would only have 41.25 watts per square foot. The edges of the cab will be dim. Maybe 2 more lamps for that size of cab. My usable footprint is 18" deep and 27" wide. I have 6 lamps at 330 watts 3.375 square feet. That is 97 watts per square foot
I came up with a new idea that has worked for me. I needed a heat mat for my clones. I'm poor and cheap so I got an old ceramic tile and put it on my ballasts for my veg lights. The ceramic absorbs and releases the heat quite well. I get better root times too. More bang for the buck.
And how do you apply that? Do you amend it in the soil? Top dress? If amended did you let the soil cook for a time before use?
Dude your setup is motherfucking tizz-ight! Great work! Love the floro efficiency!!!