I only just noticed tonight, after using it for three weeks! I'm planning to return it and buy another one. I never thought this would happen to me, I've always been so lucky with the lighting on my kindles. Wish I could upload a photo from my iPad. It's really obvious between brightness 4 and 7.
I mean, this is not just a matter of opinion, I can see the LED is missing, so that is a faulty device.