Originally Posted by HarryT
They don't. The Kindle Paperwhite has light levels adjustable between "1" and "24". I find the 10-12 level perfect for reading in the dark. At "1" the light is a bare glimmer, even in pitch darkness.
A few people using the new Kobo find the lowest light setting much too bright for them: https://www.mobileread.com/forums/sho...d.php?t=194786
I only have the lighted case for my kindle, there's no way to adjust it. I think it's perfect, not too bright, not too dim. I've used reading lights that were ridiculously bright and would be disappointed if the lowest light setting were like those ones.