Brown, wilted leaves

[FlyingHedgehog]

I can work with that Thanks for your reply!

[FlyingHedgehog]

Ok, thanks a lot for the advice!! I'll do as you recommend. Adding the other information to the post now!

[SoOrbudgal]

I agree with Catfish22 little too much light and a bit overloved

[Catfish22]

Nutrient burn and light burn. Cut your nutes to 50% and move that light out to at least 50 cm.
The leaves won't recover but it might still grow out ok.

Tell us more about your pH, watering cycle/habits, medium and such and we can help more great on the pics though!

[FlyingHedgehog]

Hello dear fellow growers, I need your expertise.

My plants (white widow) are 5-6 weeks into flowering, and now very suddenly developed both yellow markings and especially wilted, brown leaves (see photos). It came extremely quickly out of nowhere and on all the plants in the growroom. On each, only the top part of the plant is affected, further down they look healthy (see last photo).

The lights (600W LEDs) are at about 20 cm distance from the top. I use the T. A. Tripart nutrients and have upped the amount lately(a bit higher than what's recommended on the bottle), could it be a nutrient burn? Do you think it's the same problem (wilted leaves/yellow markings) or two separate ones? (I'm more concerned about the former, it's much more prominent). What else could be the problem?

Growing in soil (parts perlite and coco coir)
600 Watt LEDs / 12/12 light plan
pH 6.4
Watering every 3 days with 10+% extra runoff

Thanks for any tips and happy growing!