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I have the habit of reading a lot in pitch black darkness (before falling asleep), and after a few minutes even the lowest brightness of my tablet (iPad 1) or phone (Samsung Galaxy Pocket) starts to be too much.
I wonder if backlit e-ink devices have a lower minimum brightness, or if it is similar to that of tablets and phones.
I ask mostly because it would be impossible to test this realistically in a shop.
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I experienced the same annoyance when using my Smartphone at night time in a very dark room. Fortunately I discovered the Android app Screen Filter lately which enables additional screen dimming.
The app works totally fine on my Galaxy S4, but as the display is used outside of its intended range of brightness, the color reproducibility is far from perfect.
For the rather simple purpose of displaying text this should still be sufficient.
So this could be a feasible for your already owned devices. (I don't know if there exists such an app for apple devices)
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I don't know every single ereader on the market, but my Kobo Glo has a lighting that when set at its lowest level don't hurt my eyes at all.
Furthermore its screen is not backlit. Eink screens are different from LCDs, they are an entirely different technology and are not lighted from behind. Usually their lighting is provided by LEDs positioned on the side of the screen, so that the screen receive their light perpendicularly and not directly emits it. In fact, there are also ereaders without any lighting at all, it is a feature separated from the screen itself.
This way the light is pointing towards the screen and not directly into your eyes, resulting in a comfortable reading.
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