Light, water, wind or nutrients

Burning from long term over feeding. Not light, water or wind.

I'm in agreement with those that have said she has nitrogen toxicity. Very dark green glossy leaves. Most likely blocking out other nutes. If I was in your position I'd only water next couple tines before using nutes and I'd lower the ratio of nitrogen when I go back onto feeds.

plant looks overfed. need to give it less feed. and I bet it could tolerate more light then. The mediums likely over saturated o the more light it gets the more it drinks/eats and then burns. No idea the metrics of 50 or 2.8 vs 2.0. means nothing till we know what it is measuring or comparing to.

Hey StJames! Week 7 is a stressful time to be "freaky," but looking at the image, those burnt tips alongside the very dark green, waxy leaves suggest you're dealing with a bit of Nitrogen toxicity rather than just light burn. When the leaves get that deep forest green and the tips claw downward, it’s a sign she’s had a bit too much "fuel." Since you're already in late flower, you want to ease back on the Nitrogen and focus on Phosphorus and Potassium. Your watering intuition is actually pretty good letting the soil dry out helps oxygenate the roots, but don't let it get so bone-dry that the microbes die off. Keep your pH stable and maybe give her a plain water rinse next time to help clear out some of those excess salts. She's looking frosty, so just a little fine-tuning will get you to the finish line! Happy Growing Growmie🌱

Week 7 flower shows mild nutrient and watering stress rather than a major deficiency. Dark green clawing leaves and burnt tips suggest slight overfeeding or the soil staying too wet too long. Since the plant is very sensitive, watering at 2.8 moisture may have been too early. Light stress is less likely at 40% intensity and 24” distance. Let the soil dry more between waterings, reduce nutrients slightly, and avoid increasing light. Damage won’t heal but new growth should improve within days.

hi StJames....... Verstehe das Problem mit dem Messgerät nicht so ganz.....?😒 Würde auf ein Messgerät verzichten und den Boden mit den Fingern auf Feuchtigkeit prüfen oder den Topf anheben. Wenn er leicht ist einfach giessen....... 40 % Lichtintensität ist natürlich in der Blüte etwas wenig........ teste es mal aus, woran es noch liegen könnte..... Viel Glück

don't know what u mean by ur question but here some thoughts u have N excess (dark green and glossy leaves) and more likely it leads to K lock (that's why u have burned tips and edges) also u have P deficiency and underwatering issue

the burnt tips are not caused by the light.. that's not how light damage progresses... that's related to overfeeding too, most likely. leaf symptoms are not discrete.. need to cross-reference as much as you can to eliminate possibilities. download a marijuna leaf symptom chart to reference.. you'll see more than one thing can cause burnt tips. With a lush plant, and limited info otherwise, leaning overfed.

looks a bit overfed - extra lush/dark sounds like bad watering habits based on inductive reasoning. Stick to well-established norms... this is just a plant, not a magical unicorn. 1) fully saturate (10% runoff if soilless) 2) wait for appropriate dryback and repeat. Don't need a metere. feel loss of weight or depth of dryness. If you re-irrigate at same loss of weight, it'll require a similar volume of water each time. You do not choose the volume of water to give. You give enough to accomplish step 1 above. This should never cause a probem and if it does it is the fault of the medium's constitution.