Leaves look burned and pigmented

To me it just looks like anormal Defiency......because all plants all leaves look the same. I might exclude the lightburn, because of beeing the same picture on all Plants in every stage Go higher in your Feedings, espeially Nitrogen, calcium and magnesium... that helps them to drive the Photosynthesis

Looks to be a potassium deficiency, you’ll generally see symptoms on older leaves,but notalwaysSometimes you’ll see the symptoms at the top of the plant. Leaves with a potassium deficiency get yellow, brown . Plants may stretch and stems may become weak, but leaf symptoms are more noticeable. The leaf symptoms appear somewhat similar to an iron deficiency in that they can turn bright yellow, but the tips of the leaves curl as the edges turn brown, burn and die. Cannabis potassium deficiencies can cause your cannabis leaves to turn white, yellow, brown or burnt looking, but the inside veins almost always stay green. Sometimes a Potassium deficiency is made worse by overwatering, Hope that helps and good luck to you