Personally, I don't know. I change the light level as need when reading. And I do that by running my finger up and down the left edge of the screen. If the screen is to bright, I make it dimmer. If I can't see the letters, I make it brighter. I think that is running between 5% and 30%, but I don't really know.
Of course, I do turn it all the way up and use it as a torch to find my way around at night without disturbing others. So long as I don't look directly at the screen, I'm OK.
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