I'm not sure an e-Ink screen inverted (night mode) would make a lot of sense because the screen is not backlit. I think it would probably just require more lamp lighting to read. It does make sense with backlit LCD screens because you can turn down the brightness and read in near darkness without much glare.

If someone wanted to test whether inverting an e-Ink screen improves reading in low light areas, they could creat a simple html file and set the CSS for the body tag to:


body { color: white; background-color: black; }

That would set the page color to black and the text color to white. Or you could add this tag in calibre when you convert a book.