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.

How do I fix a greyed out night light?

If the Night Light option is greyed out on your Windows computer, update your display driver to the latest version. Then launch the Registry Editor and delete the blue light reduction entries. Alternatively, you can also create a . reg script to automate the whole process.

Why can't I turn on night light settings?

Select Start, then enter settings in the search box. Select Settings > System > Display > Night light. If your night light toggle is grayed out, you may need to update your display driver. See Update drivers in Windows.