I would lose the "spot-grow light" and cram as many 6400K lights in there as space and heat allow. They're like $3 a tube.

I've compared those expensive "Grow-and-show" tubes side-by-side with ugly-ass 6400K workshop-blue fluoros, and for growing pot, the "plant" tubes suck. (That's why nobody serious uses them...) Check the data sheets; compare lumen output. All will become clear.

Those "plant" tubes are for keeping the low-light decoratives at the mall looking good, and not growing large and thus requiring maintenance, transplanting, frequent watering, etc., etc.

Indoor cannabis growing has different requirements. Keeping a plant attractive, while in a state of suspended animation, is not among them.