One of my concerns when I bought my Oasis was how the lack of blue light filtering would affect my sleep. But even with 12 LEDs, I've thankfully had no trouble falling asleep at night. Mind you, I keep the frontlight at the lowest level possible - just enough to illuminate the screen and not look like a tablet.
However I still prefer reading on a yellow tinged background at night. I can sort of achieve the effect by sitting near a warm light source with the frontlight just barely turned on.
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