Love your build. Mind sharing the details on it?
Also, you can probably get a lux meter for about twenty bucks and use some tables with warm white color temperature to convert to PAR roughly. You probably want to have about 800 PPFD ideally spread out uniformly at the canopy. Those reflectors may be counterproductive in terms of coverage. Anything beyond 1500 is wasted energy. And 1000 should be more than enough.