All the damage is at the top... possibly too much light. A lot of leavs close together at the top, too, which means at one point it was stacking nodes quite tightly.
If way over 35-40 dli, dial it back.. even if near top end of that recommendation maybe dial back 10-15%. (10-15% less dli, not 10-15% on your dimmer knob, necessarily.)
If this is soilless/hydro, a rundown on ppms per nutrient molecule would help a lot. If you did the bro-science and blasted it with P and K, could be lockout form that, too. That has chlorosis at the top that will progress to dead spots if you ignore it long enough.
If significantly over 180-200ppm K, at some point it will be a problem even if it takes weeks to see something. Feeding over this will just increase K in runoff.
If P is way over 80-100 it'll start causing issues. Really only need 50-60ppm of P. the rest is just pissed down the drain in runoff.
this also depends on some orthodox levels of the other nutrients.... See "Mulder's Chart" for complexities of interrelated nutrients. if in soil, these numbers are useless to you.