WW auto (day 47) Nute or Light burn?

I wasn’t really paying too much attention to this grow. Just pop the seed in the pot and put it to the back of the tent, but now since she’s the biggest in the tent, I moved her to the center about 3 weeks ago. Looking at her closer, I notice the tips are browning (it’s more noticeable on the bottom leaves but not by much).
My question is this nute burn? (I use Advance Nutrients with Flower Fuel as an additive supplementary for bloom.) Or is this light burn? (It’s about 15in from the 2000W LED.)

that is a ruderalis pheno of whatever it came from. you can tell by the 3 larger blades and 2 smaller ones. happens, it may stretch for 6 weeks or so. have one of these situations currently out of a batch of kosher og seeds, one has ruderalis traits