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Cause of serrano pepper leaf discoloration?

I am growing this Serrano pepper plant indoors under grow lights.


Over time I have noticed a yellow tinge proliferating across the leaves - but it is different than the sort of yellowing I have seen on outdoor plants.


These leaves are getting that yellow tinge but they are not weakening and falling off. The plant seems relatively healthy and has recently begun producing peppers.


I'm trying to determine if this discoloration is being caused by LED light burn, or some kind of mineral deficiency.


Thanks for your help.






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