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f.lux

Version documented: 4.120 Installer type: .exe (user-level) Hives written: HKCU

📁 Registry Paths

Path Hive Purpose
SOFTWARE\Michael Herf\f.lux HKCU Application settings and preferences
SOFTWARE\Microsoft\Windows\CurrentVersion\Run HKCU Startup entry
SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\flux HKCU Uninstall entry

🔑 Keys

HKCU\SOFTWARE\Michael Herf\f.lux

Value Name Type Example Data Description
dayK REG_DWORD 6500 Daytime color temperature (Kelvin)
lateafternoonK REG_DWORD 5000 Late afternoon color temp
eveningK REG_DWORD 3400 Evening color temp
nightK REG_DWORD 2700 Nighttime color temp (default warm)
lat REG_SZ 40.7128 Latitude for sunrise/sunset calc
lon REG_SZ -74.0060 Longitude for sunrise/sunset calc
location REG_SZ New York, NY Human-readable location
dimOnBattery REG_DWORD 1 Dim extra when on battery
transitionSpeed REG_DWORD 3 Color transition speed

HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Value Name Type Example Data Description
f.lux REG_SZ "C:\Users\User\AppData\Local\FluxSoftware\Flux\flux.exe" /noshow Auto-start entry

HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\flux

Value Name Type Example Data Description
DisplayName REG_SZ f.lux Display name
DisplayVersion REG_SZ 4.120 Version string
Publisher REG_SZ Michael & Lorna Herf Publisher
InstallLocation REG_EXPAND_SZ %LOCALAPPDATA%\FluxSoftware\Flux Install path

📝 Notes

  • f.lux stores location and temperature preferences in HKCU\SOFTWARE\Michael Herf\f.lux.
  • Color temperature values are in Kelvin: 6500K = daylight, 2700K = warm/candlelight.
  • The /noshow flag in the startup entry suppresses the splash on login.
# Export f.lux settings for migration
reg export "HKCU\SOFTWARE\Michael Herf\f.lux" "$env:USERPROFILE\flux-settings.reg"

# Set location coordinates for automatic sunrise/sunset
$path = "HKCU:\SOFTWARE\Michael Herf\f.lux"
Set-ItemProperty -Path $path -Name "lat" -Value "51.5074"
Set-ItemProperty -Path $path -Name "lon" -Value "-0.1278"
Set-ItemProperty -Path $path -Name "location" -Value "London, UK"

🗑️ Cleanup

# Remove f.lux settings and startup entry
Remove-Item -Path "HKCU:\SOFTWARE\Michael Herf\f.lux" -Recurse -ErrorAction SilentlyContinue
Remove-Item -Path "HKCU:\SOFTWARE\Michael Herf" -Recurse -ErrorAction SilentlyContinue
Remove-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" `
  -Name "f.lux" -ErrorAction SilentlyContinue

📦 Package Managers

Manager ID / Command
winget winget install flux.flux
Chocolatey choco install flux
Scoop scoop install extras/flux