On Windows 10, Night light is a feature that reduces the blue light on the screen at night to help reduce eye strain and improve sleep quality. It’s similar to Apple’s Night Shift and Android’s Night mode.
However, if you enable Night Light on your device, sometimes the feature may not work correctly (usually, after installing a new feature update, such as version 2004 or a previous release). For example, Night Light may not turn off automatically on schedule, even after restarting or powering off the device. In other devices, the blue light filter option appears grayed out and there is no way to enable it.
In this guide, you’ll learn a few ways to try to fix the blue light filter feature on Windows 10. (If you can’t change the Night Light settings because they appear grayed out, use this guide to reset the feature.)
How to fix Night Light on Windows 10
On Windows 10, Night Light depends on your computer’s graphics driver to adjust the color temperature to reduce the blue light. If the video card driver installed isn’t compatible with the version you’re running, there is a chance that the feature will be grayed out or it won’t work correctly.
Update graphics driver to fix Night Light
You should manually install the latest video driver to resolve this issue. You can perform this task by visiting your PC manufacturer’s support website to download the latest graphic driver, and use their instructions to update your device.
To reinstall the graphics driver manually to fix Night Light, use these steps:
Open Start on Windows 10.
Search for Device Manager and click the top result to open the app.
Expand Display adapters branch and select the video card.
Right-click the device and click the Uninstall option.
Check the Delete the driver software from this device option (if applicable).
Click the Uninstall button.
- Restart your computer.
After rebooting your device, Windows 10 should automatically reinstall the latest graphics drivers available from Windows Update. However, it should be noted that if you checked the option to delete the driver from your device, you may need to reinstall the driver manually.
To ensure that Windows 10 installs the driver back on Settings > Update & security > Windows Update, and click the Check for updates button.
If you’re using the driver available through the graphics card manufacturer, you can use the Display Driver Uninstaller (DDU) tool to perform a clean uninstall of the video driver, and then reinstall the driver to see if it fixes the Night Light problem.
Disable Night Light completely
If you’re able to enable the feature, but it’s not turn off automatically on schedule, and updating the graphics driver didn’t fix the problem, the workaround is to manually disable Night Light.
To disable Night light on Windows 10, use these steps:
Click on Devices.
Click on Display.
Turn off the Night light toggle switch.
Resetting Night Light settings manually
To reset the Night Light settings using the Registry to fix problems, use these steps:
Type regedit and click the top result to open the Registry.
Browse the following path:
Inside the “Cloud” (folder) key, right-click and delete the following two keys (folders):
Restart your computer.
Once you complete the steps, the Night Light settings will be reset, and the feature should start working again.
Although Night Light is a useful feature coming to Windows 10, it’s not exactly new. F.lux is a third-party utility that has been around for years, and it works exactly the same as the Night Light mode supposed to work.
If you want to give F.lux a try, at least until Microsoft fixes its own feature, you can learn how to get F.lux and set it up using this guide.
Reinstalling Windows 10 to fix Night Light
When nothing works, and you really want to use this feature, as the last resort, you can try reinstalling Windows 10 with the May 2020 Update using a clean install.
Update June 26, 2020: This guide was originally published in April 2017, and it’s been revised for the latest version of Windows 10.