What problem is this guys i have others in same condition but only this plant or exactly this leaf have shown a disoloraton in one side kighter in one side black
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Can you provide a little more info, like a whole plant picture. What soil, what nutrients, how much nutrients and what ph you are feeding?
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Also, is it possible you may have gotten water/feed on the leaf, and it cooked it under the light?
I’m not saying it is, just throwing it out there as a maybe until we have more info.
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Only this leaf is showing a problem i was thinking about water burn but htf water droped there
Soil is good ph optimal i done only two fertilizing
One for roots and one time nitrate
… ps i saw this black in morning sun wasn’t out
So it may have created at night 
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One friend told me phosporus defficency…
But i dont think so
What kind of soil? Plain pro-mix? Amended super soil?
How old is the plant?
I ask these questions so I’m not guessing for answers. While it looks like it could be a P deficiency, I doubt a plant that size (in veg?) would be P deficient.
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soil i made by myself mixing soil with-old sheep dung-and peat- perilit … isnt my first time making this mix and have done good always
vegetative week 4 from seed
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i’d just keep a close eye on it. the new growth seems good as does the rest of the old growth. maybe bugs of some sort?
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yes other plants are very healthy too
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yeah honestly I wouldn’t worry too much. Just keep an eye on it, as long as it doesn’t get worse you are alright. It could be as simple as that one plant is nute sensitive, compare to the others. As long as you stay on top of it, and make sure there’s no other issues or pests, you should be just fine. 
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I would keep an eye on it, as it dose not look like code red just yet and if you were to intervene now it will only make it more complicated. Plants sometimes have a characteristic that are theirs alone.
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Are you checking your water/nute pH?
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Plus you are very young. The plant is just beginning.
Like my friend says ph. It does make a big difference. Sometimes the plant want do much at all if ph is bad.
Good luck growing.,