Light stress

The short answer is..it could. What's your light schedule? I would look into DLI or daily light intake. It's easy enough to calculate and will help when trying to dial in your grow. You can achieve the same DLI by increasing exposure (time the lights are on) or increasing intensity (increasing light power or lowering light closer to canopy) and those work in reverse as well. You could decrease DLI by decreasing intensity and/or decreasing exposure.

Your plant is starving, it is not "light stress". 7 weeks without feeding is the reason. Your plant needs extra feeding when flowering. 18/6 is optimum for autos.

I don't see that your plant is stressed at all by the light.. if you're concerned about it, you could do a little LST to pull the taller colas away from the light a little but I had one grow where the colas (and many buds) were sitting even closer to the light and it didn't bother them at all. Put your hand over the tallest one and see if the heat from the light hurts your hand... if it doesn't, they'll be fine... if it does, then tie a soft strip of cloth or something around the stem and secure the other end somewhere so it's pulling the whole branch down and away - but be gentle as you don't want to snap the branch! Personally, I think your grow looks fantastic and I wouldn't do a thing! Good luck!

Hi there I wouldn’t change the light hours from 12/12 .. If you can dim the light or raise it if your concerned about heat stress, Lower fan leafs starting to fade/fall off is normal this far in flower, BUT It does look like you could do with a PK booster to give her that extra energy though.. Try not to over water, Best of luck 🌱

after looking through diary, it all happened during week 5, week six is bad already, by that date all ph imbalances come up. make sure your ph is right and your meter is showing right

to me it looks more like root issue and lack off potassium, they need pk boost , lack progressed too far. But you could squeeze few feeds in a row and then prepare for flush. Colour wont go back, and let it be, your target now is fatter buds, not esthetics my personal guess.