Billy so glad you asked my opinion, much love.

Okay, check your temps, make sure you've got a thermometer recording the highs and lows, you can see that your leaf tips are pointed up, not just the brown ones, but the edges as well, they're burning. I think the hots might actually be hotspots, did you accidentally let the plants grow into the lights? I've seen these spots before too on my bubbles, they grew into the CFL's and I didn't catch it for a few hours.

If its not nutes or mights, it's gotta be the temps.

Also check your humidity, and... are you foilar feeding? (using a spray bottle) - Water can act as a magnifying glass (seen this as well), if your not letting your water sit long enough, you might also be seeing drying out from the partials that are left after the water has evaporated.

Wanted to add - bottom trich's are already looking rich! gonna be a nice smoke If need be, trim off your fan leaves, you don't really need them, but don't let that spread.