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.
I don't know if your eyes are insensitive to light or mine are too sensitive but 10-12 in the dark would blast my retinas out! I use 2-4 in the dark.
I can see the light from 1 even with the lights on. And I can using 1 in the dark. It's dim, but I wouldn't characterize it as a bare glimmer.