Okay so I know that night mode is supposed to filter out blue light that is bad for the eyes, but is it really more helpful than annoying? At night I do use it when I’m on the phone but it doesn’t make sense to keep it on during the day when it’s bright outside does it?

  • $\begingroup$ Helpful for what? $\endgroup$
    – kmm
    Jul 8, 2018 at 14:33
  • $\begingroup$ To protect your eyes from high energy light waves? $\endgroup$
    – user306598
    Jul 8, 2018 at 14:45

1 Answer 1


Different colors mean different wave lenght and energy, as displayed in the picture. Wave lenght

Using Planck's theory, the shorter the wave is, the more energy it carries. On day light, all these wave lenghts are present, including UV from sun. With no sun-light, your eyes aren't hit by those, so there's no need of using higher energy waves (that's exactly how night mode on iPhone works, using only lower energy waves).


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