Autoflower question

Hey guys this happens to me alot during end of flower with autos I dont know whether it's light burn,nute burn or a def,and it only happens with my autos I do try to use alot less nitrogen during flower I use bc nutes with pro mix,the leaves start turning yellow with green veins and it's mostly just fan leaves and the leaf stems turn purple and are very easy to pick outwhich I read could be a nitrogen def,but also could be light burn,I also realize ot could jist be end of life but the pistils are just turning Orange

give some more info on ur grow and take some pics in natural light

Yikes ... she looks a bit fried . Remember that autos can be way sensitive to stress , and will just throw in towel whether finished or not. Can barely make out brown spots / mottling on leaf but you need lots of pics under normal light.

My guess is your feeding may have been off / ph . Autos only need to live for 90 days average so complicated feeds sometimes causes problems.