LightBulb 2.7.1

LightBulb reduces eye strain with smooth color temperature shifts, advanced customization, and minimal performance impact.

Razvan Serea News Reporter Neowin · May 20, 2026 19:00 EDT with 0 comments

LightBulb

LightBulb is an application that reduces eyestrain produced by staring at a computer screen when working late hours. It has similar functionality to Windows 10 built-in "Night Light" feature, as well as to some other apps like F.lux but offers additional features and better customization. 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.

LightBulb features:

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

LightBulb 2.7.1 changelog:

Enhancements

Add Simplified Chinese (zh-CN) localization support by @wcxu21 in #425
Add LIGHTBULB_ALLOW_AUTO_UPDATE env var to suppress auto-update in GUI by @Copilot in #434
Move tray icon setup and bindings to XAML with compiled bindings support by @Copilot in #428
Add PowerKit and replace custom utilities/extensions by @Copilot in #441

Fixed bugs

Add localization for tray icon context menu items by @Copilot in #426
Fix Ukrainian translations for preview/demo button by @Copilot in #430
Improve localization: merge transition tooltip strings with markdown, improve translations by @Copilot in #431
Prevent long translations from overflowing buttons and settings labels by @Copilot in #429
Fix Simplified Chinese system language detection by @Copilot in #440