I tend to be a reader who is anal about battery consumption, which is why I don't read on my phone or tablet. So I can understand wanting to keep your back light off unless it's really needed. Myself, I'm almost always in a book. Rarely am I on the home screen. If you are in a book and find yourself suddenly in the dark, you can slide your finger up the left side of the screen and the back light should come on. You can adjust it by sliding up and down the left side. This doesn't seem to work from the home or library screen.
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