It's mainly the dark outer sections of the leaves you see, the yellowing would come from lower in the plants, and work its way upwards, rather than yellowing in the middle of the upper leaves out wards.
If the whole leaf was going lighter, I'd say it needs feed. But from the op, I'd say it's most likely over watering. As the medium isn't drying out enough between waterings.
Under an led too, they will not drink so much as they are colder, so water will sit in the medium for fuckin aaaagggggeeessss! Lol
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