Thank you for the replies, they're very revealing. At those low settings, the Libra 2 looks like an ereader without frontlight, like my old Sony 505. I find this too dark because the lighting in my main room is quite dim.
Early in the day 10% at full blue light seems okay as long as I prop the reader up about an arm's length away from my eyes and take regular breaks (easier said than done). Later in the day, I turn the light down to about 6% with the warm light about half way. The later it is, the more warm light and less brightness.
The kindles always have the light set between 10 and 12, which looks much brighter than the kobo but doesn't affect my eyes. I'm not sure if it's the technology or size of screen which makes the difference. If it's related to screen size, perhaps the OP would be better getting a kobo Clara, if the light bleed problem has been solved.
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