Have been flushing for 2 weeks now, one more watering then going to let plant dry out and start wilting before i cut it down and hang to finish drying.
Havent got a proper jewelers loupe but read about using phone camera i think it worked good enough.
Bottom leaves that receive basically no light will die off, outside in the sun it can reach those bottom leaves no problem.
But with an LED light it can't quite get under the canopy and give them the energy they need.
Happy growing