BatGuanoanswered grow question 4 years ago Hi KcKoolaid,
It might be light stress but it is more likely that your Jack comes to the end of her journey. It is normal for leaves to turn a bit crispy at the end. Your overall plant looks okay as on as the same damage doesn't spread to sugar leaves (sugar leaves are the ones with one finger coming out of the bud itself). If the sugar leaves start changing the colour, then you can start worrying.
Just in case that it is the light or heat stress, you can tell by touching the buds that there are becoming fluffier and less heavy. Then immediately cut the loss.
Hope this helps,
Nice yield mate,
Happy growing!
Y