I use my old Palm (Sony Clie TH55) when I want to read without blue light issues (older people have poor sleep at best). Amber text on black background and a yellow plastic film overlay blocks all the blue. That is reading close without glasses.
The Nook amber seems to be pure amber LEDs not the RGB mix other devices use. But I really miss being able to invert screen by choice
I know it should be possible on the nook since it inverts when the screen blinks.
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