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I assumed it was a dopey cheap tablet. I've a Libra and a Libra 2.
Either your Libra is faulty or you have very strange eyes. My night sight is pretty good and 1% to 3% is really too dim on either for comfortable reading in "Light mode". A Tea-light and an old paperback is brighter.
Also you can vary the 2nd slider to make it more orange, which is dimmer.
It does go in 1% steps and below 5% is very dim. More than 8% to 10% might be a little bright if you are in total darkness.
Are you in a basement, or a room with total blackout blinds?
Maybe it's defective if there is not a smooth gradation between 0 and 10%.
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