When used in bright light, let alone sunlight, no device using an LCD-display is going to catch up to e-Ink. The LCD-display must overpower the ambient light in brightness to be seen. For the e-Ink display, it's just the other way around: the more ambient light there is, the better the display will be readable.
If I'd take my Kindle outside right now, and go sit in the sun, then the front light effectively does nothing, not even on setting 24. It just isn't bright enough to make a difference. The screen is easily readable though. In the same circumstances, I can't even read my phone or tablet on the highest brightness settings they have.
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