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One more information: temp 70 F, humidity 45% and light cycle 24 hours on. Can be some kind of light burn?

Hello dear comunnity I found this weird thing on some of my lower leaves. I am growing indoors under 400w spider 9 cob led, strain Glueberry OG from Dutch Passion, 3 weeks in veg, the medium is soil (biobizz light mix). Nutrients are Cal max from Grotek until 0.4 EC then Bloom stimulator and...