Light Switch Tool Generates Excessive Log Files (300GB+)

[Wizardous]

Microsoft PowerToys version

0.95.1

Installation method

Microsoft Store

Area(s) with issue?

Light Switch

Steps to reproduce

1. Enable Light Switch tool in Power Toys.
2. Set theme switch schedule to fixed times (e.g., 6:00 AM and 6:00 PM).
3. Perform a few manual theme switches to test responsiveness.
4. Leave the tool running overnight.
5. Log in the next morning and observe disk usage.

✔️ Expected Behavior

Light Switch should switch themes at scheduled times without excessive logging or disk usage.

❌ Actual Behavior

• Upon logging in the next morning, I discovered ~300GB of disk space had been consumed.
• Investigation revealed two massive log files at: ~\AppData\Local\Microsoft\PowerToys\LightSwitch\Service\Logs\v0.95.1
• The logs contained repeated entries every few milliseconds, suggesting a runaway logging loop.

Example snippet from the log:

[2025-10-27 23:05:01.662420] [p-30304] [t-23424] [info] [LightSwitchService] Manual override received while schedule OFF.
[2025-10-27 23:05:01.662427] [p-30304] [t-23424] [info] [LightSwitchService] Manual override received while schedule OFF.
...
(repeated hundreds of times per second)

• I had to disable Light Switch and manually delete one log file to reclaim space.

Additional Information

• OS: Windows 11 Pro
• .NET version: 9.0.302
• System Language: English (India)
• Running as Admin: Yes

Other Software

None interacting directly with Light Switch

[OSLDNKKfEUVTABDLiNgk]

I have this issue too. One of the logs is 425.7 GB and the other is 358 GB!

[Neptune-mk2]

The issue has not been resolved in the latest release, it continues to generate excessively large log files, It had generated two 40+gb files completely filling the drive of my Surface Go 2

This is an image of a file it generated shortly after deleting the other two, it is too large to be opened by notepad

[Yue-Sui]

I installed PowerToys yesterday and used the ‘Light Switch’ function to replace a similar app called ‘Auto Dark Mode’. However, the log files ended up taking almost 400GB of space on my computer. Here are my related settings. By the way, it was a terrifying experience!