Stickanswered grow question 6 years ago Hi bro, hard to tell you exactly what's wrong here, but here are some clues : this could be strain-related, heat or light stress, or LED-panel related...
A couple of questions to better understand your situation : what is your LED panel manufacturer and model ? How old is it ? Do you disassemble and clean it regularly ? What's the distance between your LED and your apex ? What you could try : reduce light hours (14 is too much for a regular strain, 12 would be ideal), avoid to move your plant (changing her environment frequently may generate stress and/or low flowering), decrease the distance between your light and your apex (if using 135W LED, you can generally go for 20-30cm). I'll be around, good luck with this monster, patience will pay !