There's also a custom option where you can manually control the amount of blue light emitted from the screen, and set different colored backgrounds to your preference. (blog.the-ebook-reader.com)
This suggests we can help kids by using blue light filters and monitoring their access to technology. (parentingscience.com)
It makes the screen get warmer closer to your bed time in order to reduce the amount of blue light emitted from the screen. (pocket-lint.com)