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Come to think of it, you only need 2 settings:
1- Off: the majority of the time, when reading in daylight
2- on: A faint backlight to make it readable in pitch black dark rooms.
Anywhere between pitch black environments, and daylight, one can either turn on or off the backlight. The weak backlight would be improved by environment light, so the lighter it gets, the less you need to depend on the backlight.
As long as you got these 2 bases covered, to be able to read comfortably in pitch black rooms, and to be able to turn it off in daylight; you have basically covered all possible situations.
I don't see the need for making the led backlight as bright as tablets or LCD's.
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