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I think another question might be, if the device uses more power to display black, than white; not in terms of color display, but in terms of magnetism.
Like, is it harder to repel the pixels, or is it harder to attract them?
Not knowing the answer to this, without any measurable proof, I think it's pretty safe to say, that the power used by displaying night mode, will be well within 10% of the power used to display regular mode.
The screen itself uses only a fraction of the power used by the entire system, so that 10% might reflect in a less than 1% battery difference.
The CPU, WIFI, and screenlight, each use far more battery than the screen itself.
A second argument may be, that if you're reading at night, and use the screen light, you might need more screen light for white text on a black background, than on standard view; and thus need more backlight.
I would conclude, that in broad daylight, it is much better to the eyes, to read in 'night mode' on the screen (less bright white on the screen, means less burning in the corona), and at night, 'night mode' needs to be off.
Totally opposite of an LCD monitor.
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