Regards the lights and your fear of getting sore eyes from over-illumination, the setting for the light on both the Kobo Glo and Kindle Paperwhite ranges from 0-20, so there is a very wide range of light. Your eyes won't get tired/sore the same way as they might do when looking at a computer screen, as it's a different type of lighting as meeera explained.
The light on the Paperwhite tends to be a little duller at the lower settings than the Glo, but with the Glo you can turn the light off completely (with the Paperwhite when you put it at it's lowest setting it's not actually off but isn't noticeable except in the dark).
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