Mine doesn't have light cones, except if I hold the reader at an extreme angle so I'm looking almost directly into the lighted edge. I can't see them while reading at any normal angle, and I don't see any color change on the screen.
My big gripe is I find the battery life not even close to as advertised, unless the battery life slider is wildly inaccurate. I read every night before going to bed and typically the kindle + cover drains 15% during one session. Doing the math, this leaves me with <7 days of reading before my Oasis is dead. I read probably 1-2 hours and have the light set on 8-10. I keep it on airplane mode unless I look something up in wikipedia, and when I'm done I put it back in airplane mode. There is no way I could ever get "months" of reading between charges on this device.
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