The Light on the Kobo applies a blue tinge on everything, including the text, and reducing the contrast of the text. Of course, it's a perfectly good trade-off for reading in innadequate light. The paperwhite, however, has done something so far completely different from everyone else. I'm only speculating, but the light from the Paperwhite reflects very differently from the e-ink 'white' pixels, and the black, by comparison, really pops out. That's why amazon suggests leaving the light on all the time, (actually, turning it up to bright when in a well let room.)
I can't speak about what percentage of Kindles have the multi-colored blotches, but it seems to me lots of people jump in on that problem to complain about the 'shadowing' at the bottom, (which is normal, happens on the Kobo as well, and should not be visible unless you're turning the light so high in the dark you can use it as a flashligh. ie. making it 'glow' rather than easy to read.)
The unknown percentage of faulty Kindle screens (and the obvious supply problems probably frustrating returns,) in terms of tech used, I think Kindle is the one who got it right, by a very large margin.
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