yeah 800 for flowering though all depends on what the plants are doing as if they’re happy they’re happy as really were facilitating in their growth not following suggested values given by others as again those are “suggestions”
consider the closer the plants gets to the lights the brighter it will be and now that you have flipped to flower you many be able to flop over some tops to fill your area and get an even canopy once they really get into their stretch in 7-10 days
Btw should throw up a grow journal 