I read at night with my Clara HD at 1% brightness, all the way orange, and in dark/inverted mode. It's okay. I'd prefer to not have to use dark mode, but even 1% brightness is much too bright to use in a fully dark room (I'm very sensitive to light; ymmv).
Dark/inverted mode is easy to enable using NickelMenu, but because the Clara HD isn't intended to have it, it ghosts quite a lot. I think the Clara 2E has dark mode properly implemented, though, which would definitely be a worthwhile upgrade.
Unfortunately, I don't have any data on the comparative brightness of different ereaders, although my guess would be that bigger screen => more LEDs => brighter.
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