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The natural light automatic color shifting happens every half hour, on the :30 and :00. I have 'bedtime' set to 10 PM, and I know I still see a color shift at 10:30 PM (which is a nice reminder to close the book at the end of the next chapter). I think it starts shifting at 8:30 or 9. I wish this was better documented. I don't think it adjusts brightness, just temperature.
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