Last week plants got too close to light setup and next to wall/window when temps down to 20s couple nights from early freeze. Could be the yellow/brown leaves. Now in flowering closet, except for younger AH still vegetation growth. Topped twice and fim once, will 'lollipop' next week. Right now keeping tabs of watering PH7 mix than adding anymore fox farm in case yellowing from mix of too much. Flies gone now and not too worried anymore about 'hidden' pests. Saw good video on someone saying leaves reflect light causes which made sense in seeing first batch of spotty leaves during growth. Also just saw video on nutrient damage, right now the yellow/brown seems to be a potassium issue. Been watering plants with too high PH until couple weeks ago w/citrus acid in tap water. So could be a lack of balance than light/cold/heat.