Your display emits blue light—the kind of light you see during the day—which can keep you up at night. To help you get to sleep, turn on the night light and your display will show warmer colors at night that are easier on your eyes.
The night light strength level is for the color temperature in Kelvin. You can set a strength level between 0 (6500K) to 100 (1200K) for whatever is comfortable to your eyes.
This tutorial will show you how to change the night light color temperature strength for your account in Windows 11.
Night Light settings are stored in the registry keys below for the current user.
Open Settings (Win+I).
Click/tap on System on the left side, and click/tap on Display on the right side. (see screenshot below)
Click/tap on Night light on the right side under Brightness & color. (see screenshot below)
Adjust the Strength slider to the color temperature level you want. (see screenshot below)
48 is the default strength level.
You will see a preview of the color temperature level as you adjust the Strength slider.
When finished, you can close Settings if you like.