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Those cones are a result of the LEDs that are located in the bottom of the reader, and they all have them to some extent. I don't even notice mine, the lighting is pretty even, and I prefer the clear bottom, not the fat black border.
Yours doesn't look bad to me at all, although a bit darker at the bottom than mine appears, but that could be the light level differences we're using. But even with the slightly darker area at the very bottom, it's still much more evenly lit than if you were to use an external clip-on light, not to mention the bulk and battery use for a clip-on.
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