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I don't have rows... there is a small area at the bottom where the light is not perfect but even that area is regular (thin dark horizontal stripe)
I use light only at a very low level (5%), can't read without proper room/ambient light which would also work for a paper book, so the builtin light is only a slight assistance.
If I turn the light up higher it appears slightly blueish on my device... on my mothers H2O it's perfect white and others I've seen are outright yellow. I think there is a wide range of things that are considered normal...
You'd see extreme stripe/shadow if one of the LEDs was a dud though. However if this was the case it should always be visible regardless how much text you have on screen
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