I'm willing to give the author a pass on the white-light issue since it is a legitimate problem for some people. But I don't expect amazon to ever address that problem.
There's always a group of people that can't use a given product because they have one issue or another. For example, the Kindle Voyage isn't accessible for a blind person.
Its not just the wavelength of light that affects the sleep question. Backlit devices like the iPad are far more likely to affect your sleep than a device like the kindle, which has both lower levels of light and the light is reflected rather than shone directly into your eyes.
Exactly. I can't see why the author is complaining about white light. I have a Kindle Paperwhite and in no way can the background be called "white"! When you adjust the backlight down, it's a nice warm off-white. Maybe I have a different model, but I can't see any "white light problem".
I use a paperwhite and read to fall asleep. The white-tinted light isn't as much of an issue as people or f.lux make it out to be.
If the paperwite were tinted, this person would probably be complaining that it makes them fall asleep rather than stay alert while reading.