Thought I’d chime in and thank you guys for these post.
I was giving way to much nutes in veg but the plants handled it. When I switch to flower and didn’t change nute routine properly I got super high build up and stalled them out.
now I know why !
@Dirtbag, I have seen post where you mention Dr Bruce and his work but never followed up - glad I took the time today!!!

ComfortablyNumb said:

1570 lux? That's 1570*.023 = 36.11par?
36.11*18hours = 649.98 DLI
Keep track of that number.

Click to expand...

3.86 x10^24 watts of power too.
Pretty impressive setup (;