Could the yellowing by light burn?

No. Wrong position on the plant for lightburn and wrong optic for lightburn.

Looks like she is hungry, either because there arent enough nutrients or because she cant access them (lockout, wrong pH, something like that) Light burn is normally starting at the tallest buds and looks like you bleached the tips of your headbuds

The autumn color is from lower temps at night or possibly genetics. That plant is low on nitrogen. It does not look to be caused by the light, so you need to give more to that plant. Hard to tell if any other coinciding, but looks to be just N, suprisingly.

What hindugod said

WOW LOOK AT DAT!! LACK OF REAL INFO IN DA DIARY!!! NO CLUE IF YOU ARE FEEDING SALT OR ORGANIC TYPE!!! CAN ONLY GO BY A FEW PICTURES!!! PLANT LOOKS LIKE IT HAD A LACK OF PROPER NUTRIENTS FOR A WHILE!!! WHEN YOU FLIP TO FLOWER STILL NEED SOME N AND START RAMPING UP DA P AND K!!!! LACK OF DA PROPER NUTRIENTS GAVE YOU DA EARLY FADE IN MY OPINION!!!!

hey 👋 Your pH is a bit too high; the free seed might not tolerate the medium as well. Other than that, I would give it more Calmag and check the nighttime temperature ; I have the impression that it’s feeling a bit cold