i don't think that is light burn. leaves look crispy, glossy -- overfed. pH or nute lockout probably. marijuana brand nutes often instruct way too high of doses... professional Ag brands don't do that.
i would suggest resetting your persepective on nutrients. Try a simple run with normal Ag products and not the overpriced marijuana branded stuff... see that the same ingredients used at lower prices will have the same effects, LOL. Like, avoid "athena" where you spend 300-400 $ for products you can get for 100... AN is even worse.. probably 5-6x more expensive with all that diluted nutrient product and its water weight... and split up into 12 products for no reason other than to bilk ppl out of their money that don't know any bettr, but will adamantly argue that it's worth it... lol.