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I read a lot in bed without any nightlight, only using the light of my e-reader. I prefer the Pocketbook Touch HD for this because the minimum luminosity level is not very bright, but still shows good contrast. My Kindle Paperwhite 2, for example, doesn't have such good contrast and so it's more difficult to read with a low luminosity level. It's difficult to capture the exact lighting on camera, you'll have to see with your own eyes.
I don't think anyone would read with luminosity levels between 50% and 100% in a dark room, this is definitely not necessary and would hurt your eyes. That's why I also wouldn't worry too much about discolouration.
You don't need to worry about ghosting, either, with the HD screens. I'd definitely recommend going for a device with a high resolution and lighting.
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