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I am trying to identify weather my 3 nagami kumquat seedlings are having sunburn from being 10 - 12h / day under a small LED growlight or if this is from something else.
They are not getting direct sunlight, however they are located near a window made of milk glass, so its completely blurred and milky white, the sunlight is heavily filtered.
The LED light I use is PARUS LED grow light SOL Series (PGL-E18) specs found in english here:I keep the plants definitely more than 20cm away from the light, when turning the light off at night I spray the plants with a foliar spray sometimes, rainwater other times to maintain moisture levels.
I water with rain water every 2 - 3 days a little bit because these things have tiny roots , the rain water is mixed with an auxine based root booster and once a week I add liquid fertilizer for citrus (planfor citrus , qualifies in most areas)
They're planted in seeding soil that drains very well and also dries out nicely inside.
However the first 3 weeks I had no sign of these burn marks, only since today did I notice it.
Thing is that this happens to every citrus seedling I tried so far, tomato or chili pepper seedlings do not have this problem.
Does anyone have a clue as to what is going on?
Attached are images of each plant.

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man just google it

I suppose that sunburn can occur due to two reasons. The first is the one you mentioned, using incorrect light to grow sol plants. I have grown several different plants of this type using explosion proof LED flood lights and they took up the light quite well as the light is big and wide but not too strong and it spread evenly over each plant. And secondly, what the guys above have already said, it may be a trite excess of fertilizers, but I still lean more towards the first reason.

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