01
Confirm Night Light works manually
Open **Settings > System > Display > Night light** and toggle it on. If the screen warms, the feature itself works and the problem is the scheduler.
Night Light scheduling breaks when **location services** are disabled or the **CloudStore registry cache** is corrupted. Re-enable location and delete the Night Light registry keys to reset the schedule.
Requirements
- Admin rights
Instructions
02
Enable location services
Go to **Settings > Privacy & security > Location** and turn on **Location services**. Night Light uses your location to calculate sunset and sunrise times for the automatic schedule.
tipIf you prefer not to enable location, switch the schedule type to **Set hours** and enter manual times instead.
03
Delete the Night Light registry cache
The CloudStore cache that stores Night Light state can become corrupted. Open **Terminal** as administrator and run the commands below to delete the cached keys, then restart your PC.
reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\DefaultAccount\Current\default$windows.data.bluelightreduction.bluelightreductionstate" /f
reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\DefaultAccount\Current\default$windows.data.bluelightreduction.settings" /f⚠ warningThis resets all Night Light settings to default. You will need to reconfigure the schedule and strength after the restart.
04
Reconfigure and verify the schedule
After restarting, open **Settings > System > Display > Night light** and set up the schedule again. Wait for the scheduled time or temporarily set the activation time to a few minutes from now to confirm it triggers.
Common issues
Night Light is stuck on permanently
Delete the registry keys from step 3 and restart. The stuck state is stored in the CloudStore cache and will be cleared.
The schedule works but activates at the wrong time
Your time zone is incorrect or location services are returning a stale location. Check **Settings > Time & language > Date & time** and ensure **Set time zone automatically** is on.
Frequently asked
Can I use Night Light without location services?
Yes. In **Night light settings**, change **Schedule** to **Set hours** and enter your preferred start and end times manually.
Does Night Light affect color-accurate work?
Yes. Disable it when doing photo or video editing. You can add a quick toggle to the Action Center for easy switching.
How to undo this
The registry deletion in step 3 is the main change. Windows recreates the CloudStore keys automatically on the next Night Light toggle. To fully revert, turn off Night Light in **Settings > System > Display > Night light**.
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