Light burn ??

Well I am quite confused seeing as it looks like it could be any of the thing mentioned possibly. After watering with cal mag Monday night it hasn't gotten worse brought the light down to around 20 inches now. Will check again tonight hopefully it is recovering, flowers still seem to be develo6

Zinc ? Wow this is certainly not a Zinc problem lol this is a text book Overfeed lol you need to flush her when shes dry and then reintroduce feed at lower levels bro then you should be okay lol

It has nothing to do with your lighting. It actually is zinc deficiency in your plants. If it was lighting, the tips closer to your tops would be burnt as well. Notice the top leaves are not burned…. The larger (older) leaves are the ones are suffering…AKA searching for nutrients ( micros actually) that are missing. Try 1 TBSP black strap molasses UNSULPHERED in 1 gallon of water at your next feeding or 1/2 TBSP per 1/2 gallon. It’s micros NOT your lights. Leaf burns and the tips of the top leaves curl up and turn dark brown….your situation is a progressing one which means lacking in something. Leaf burns are acute and fast

Definitely not light burn it’s a deficiency in cal/mag. Add a dose to next feed but also check PH if possible. You will want to make sure it’s not lockout or you could make the problem worse.

Just fed with some botanicaire cal mag, left light at 24" for now. Smaller plants are approx at same height as the big girl and no signs on them

Is not the light otherwise the top would be burned not the bottom leaves, that’s a magnesium deficiency, go straight away with cal-mag and you’ll see that the plant will recovery pretty fast.