Light Stress, Colors Change, strong fan or Senescense?

I'd be tempted to give it some extra nutes, like 2-4-3 sort of balance, maybe with citric acid and some microelements, calcium, sulphur and carbs.

Your plants are sucking up mobile elements from the leaves for the flowers. So it's a combination of metabolic stress, maturity and nutrient demand. Watering and lighting of course could affect that. Main thing though, they are maturing and trying to pump shit to the flowers.

Hey there family.. If your light manufacture chart tell u how far to hang it then u adjust it for max PERFORMANCE.. Those leaves kinda look like not enough water of not regular watering ... Then if you're using nutrients check your mixture is only good for a week after you mix it.. Then maybe you need to feed full strength.. ..i think it's not enough watering/water.. your temperature could also be too hi/hot ..hope you have an air flow/fan....good luck. Nice size harvest looking like😎😎😎