Fix Night Light Options Are Grayed Out in Windows 10

Windows 10 allows you to enable Night Light mode (previously known as Blue Light) to reduce eye strain. When enabled, it makes the screen color gamma more comfortable for your eyes at night by reducing blue light. Colors become more warm and the backlight will be dimmed, so eye fatigue will be less. Some users are faced with a strange issue where the Night Light options are grayed out in the Settings app. Here is a quick workaround to resolve this issue.


Night Light is a very useful feature for people who have to work on the computer during the night or in the dark. It keeps your eyes relaxed and prevents them from getting strained. It is very frustrating if it does not work for some reason.

Normally, there are two ways to enable this feature. First is Action Center, where a special quick action button exists.
Click on the Night Light button to enable or disable it: Enable Night Light Windows 10

Alternatively, it can be configured in Settings under System - Display. Enable Night Light Windows 10 Using Settings

If these controls are not accessible in your Windows 10 instance, then try the following.

To fix the grayed out Night Light options in Windows 10, do the following.

  1. Open the Registry Editor app.
  2. Go to the following Registry key.
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount

    See how to go to a Registry key with one click.

  3. Here, delete the following subkeys
    $$windows.data.bluelightreduction.bluelightreductionstate
    $$windows.data.bluelightreduction.settings

    Windows 10 Fix Night Light Grayed Out

  4. Restart Windows 10.

After restarting, Night Light should start working as expected.

5 thoughts on “Fix Night Light Options Are Grayed Out in Windows 10

  1. Karim

    Thank you very much Sergey, I needed that solution !

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    1. Sergey Tkachenko Post author

      Please share if this helped you or not. In my case, the solution was helpful, successfully fixed the Night Light feature on my friend’s tablet.

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  2. luz noturna

    aqui a luz noturna parou de funcionar ,build 15063.413 , como resolver ?

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    1. Sergey Tkachenko Post author

      Have you tried to delete the mentioned keys and restart Windows 10?

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      1. Luz noturna

        funcionou ,obg

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