0.4.0: solar curves and temporary adjustments. Shape sunrise and sunset transitions with draggable Bézier controls, independent durations and offsets. The same curves follow the sun throughout the year. Só hoje edits a separate temporary layer that expires at local midnight; Programa edits the recurring schedule. Monitor hours and curves stay shared by default, with independent color and brightness. Existing schedules and presets migrate with a backup. See the schedule guide.

The independent application uses the documented Windows Magnification API instead of gamma/Night Light handovers. With one enabled monitor, the desktop filter includes the Windows taskbar; coverage at 2700 K / 100% was physically confirmed on the internal panel. It includes saved monitor profiles, explicit red-only mode, presets and daily schedules. Mixed profiles now combine a shared desktop filter with local monitor corrections: the internal 2700 K / 100% profile stays global while the OLED uses red / 15%. Both paths retain the native pointer, with its color selected by monitor. The signed UIAccess installation resolved interactive taskbar/Start coverage on the tested HDMI OLED; full-window dragging replaces its unfiltered outline. Native pointer gains switch conservatively near display seams. The optional protected-desktop service prepares per-monitor UAC filters; the user observed no flash in the repeated 0.2.9 UAC return test. See the protected desktop module and the renderer and remaining hardware checks. Run Candlelight.Next.exe; build/package with scripts/publish-next.ps1. The 0.1.4 physical wake test failed, so it is retained as a rollback baseline, not a verified flash-free solution. Real wake testing of 0.2 is still required.

A Windows fork of LightBulb with independent monitor profiles, exact-zero red-only output, quick presets and custom daily schedules. Current version: 0.1.4.

• Each connected monitor has its own temperature and software brightness (1–100%).
• Choose Dia / noite, Manual, or Horários for each screen.
• OLED vermelho sets 500 K and 15% brightness on the selected monitor only.
• Presets can be saved, replaced by name, deleted and applied with one click. Built-in presets are also available from the tray for the last selected monitor.
• Daily schedules accept any HH:mm, temperature, brightness and transition duration. Zero minutes switches instantly; other values start a smooth transition at that time. Schedules wrap midnight and repeat every day. Overlapping transitions are shortened to end at the next point. Invalid or duplicate times retain the last valid schedule.
• Resume, display power-on and unlock recover current values, followed by five seconds of verification. Protected handovers apply profiles behind a brief black cover. Startup skips the daylight-to-night fade.
• If GDI rejects a ramp or reports success without applying it, Candlelight tries the Windows color-system LUT and verifies it by reading that same layer back. A nonneutral GDI layer is neutralized afterwards so brightness is not multiplied twice; an already neutral layer is left untouched during recovery retries. This compatibility path is selected independently for each affected monitor. Context recreation retains its selection; exit resets both layers. A color-system filter left by an earlier process is detected, so controls cannot silently modify a different layer beneath an old filter. Startup waits until settings are loaded before allowing recovery events to apply colors.
• Physical EDID identity preserves profiles across HDMI/USB-C when the monitor reports the same serial. Devices without usable serials use the connection path.
• The app and settings use the Candlelight name. Updates from original LightBulb cannot overwrite this fork.

Extract the portable package and run Candlelight.exe. Close original LightBulb, Ahead or other gamma tools first so they do not overwrite each other. Choose the OLED in the left rail, apply OLED vermelho, then adjust its brightness. Set the internal screen's brightness to 100% separately. Changes save automatically.

This version targets SDR displays in an extended desktop. Windows/driver gamma resets can occur before an application receives a resume event, so elimination of every flash is not guaranteed. Color-system writes/readback and visible color changes were verified on the HDMI OLED and internal panel. Lid reopening retained warmth, while a Modern Standby resume produced a brief intermediate blue flash. Night Light prevented that blue flash on the internal panel, but keeping both filters active caused visible alternation. The protected handover in 0.1.4 failed its physical suspension retest; the 0.2 renderer replaces that mechanism. Hibernation and USB-C remain hardware checks. Version 0.1.4 adds a protected Night Light handover: a brief black cover hides the switch back to each monitor's Candlelight profile. The Pausa a preto option is enabled by default. Strength and schedule are preserved, and hardware verification remains necessary to establish flash-free wake on a given driver. See wake recovery details.

Settings are stored beside a writable portable executable, or in %APPDATA%/Candlelight/Settings.json for an installation. CANDLELIGHT_SETTINGS_PATH can override this. Existing LightBulb settings are not automatically imported.

Requires .NET SDK 10 on Windows.

dotnet build LightBulb.slnx --configuration Release
dotnet test LightBulb.Core.Tests --configuration Release --no-build
dotnet LightBulb/bin/Release/net10.0-windows/Candlelight.dll --preview --capture-preview=artifacts/ui
dotnet LightBulb/bin/Release/net10.0-windows/Candlelight.dll --diagnose-displays
./scripts/publish.ps1

--preview uses synthetic monitors and never writes hardware gamma or autostart registry values. --capture-preview=... verifies the compiled controls, captures three interface states and exits. --list-displays reports detected displays without changing colors. --diagnose-displays reads the GDI and color-system LUTs; --diagnose-displays=report.txt also saves the report. Both are read-only. CI builds a self-contained Windows x64 portable ZIP. Packaging excludes local settings. ColorStatus.txt is a bounded local diagnostic trace of requested values, recovery writes and errors; it is excluded from packages. It contains no location data. Installer source is rebranded but an installer is not distributed with v0.1.2.

The exact-zero color/ramp handling is adapted from LightBulb Ahead. See third-party credits and the preserved MIT license.

The following section describes upstream LightBulb; its downloads refer to the original program.

LightBulb is an application that reduces eyestrain produced by staring at a computer screen when working late hours. As the day goes on, it continuously adjusts gamma, transitioning the display color temperature from cold blue in the afternoon to warm yellow during the night. Its primary objective is to match the color of the screen to the light sources of your surrounding environment — sunlight during the day and artificial light during the night. LightBulb has minimal impact on performance and offers many customization options.

❔ If you have questions or issues, please refer to the wiki.

By using this project or its source code, for any purpose and in any shape or form, you grant your implicit agreement to all the following statements:

• You condemn Russia and its military aggression against Ukraine
• You recognize that Russia is an occupant that unlawfully invaded a sovereign state
• You support Ukraine's territorial integrity, including its claims over temporarily occupied territories of Crimea and Donbas
• You reject false narratives perpetuated by Russian state propaganda

To learn more about the war and how you can help, click here. Glory to Ukraine! 🇺🇦

• 🟢 Stable release
• 🟠 CI build
• 📦 WinGet: winget install Tyrrrz.LightBulb (community-maintained)
• 📦 Scoop: scoop install extras/lightbulb (community-maintained)
• 📦 Chocolatey: choco install lightbulb (community-maintained)

• Extensive customization options
• Location-based sunrise and sunset times
• Manual sunrise and sunset times
• Whitelist for color-sensitive applications
• Global hotkeys for adjusting on the fly
• Smooth gamma transitions
• Minimal performance impact
• Works without internet connection