LightBulb is a lightweight, open-source application designed to reduce digital eye strain by automatically adjusting your screen’s color temperature based on the time of day. By shifting the display output to warmer tones during late hours, it helps minimize exposure to blue light, making it easier for your eyes to transition during evening work sessions.
The software provides a seamless experience similar to native night-mode features, offering users granular control over their display settings. Whether you are working in a dimly lit environment or simply want to improve your visual comfort, LightBulb runs quietly in the background, ensuring your screen remains easy on the eyes throughout the day and night.
In This Post
Download LightBulb
File size: 50.0 MB
OS support: Windows
Windows
Download LightBulb 2.7.3 for Windows – Installer x64 (Exe)
Download LightBulb 2.7.3 for Windows – Installer ARM64 (Exe)
Download LightBulb 2.7.3 for Windows – Installer x32 (Exe)
Download LightBulb 2.7.3 for Windows – Portable x32 (Archive)
Download LightBulb 2.7.3 for Windows – Portable x64 (Archive)
Key Features
- Automatic Color Temperature Adjustment: LightBulb intelligently calculates the sunrise and sunset times based on your local time zone, automatically transitioning your screen’s color temperature to warmer hues as the day progresses to reduce eye fatigue.
- Customizable Transition Settings: Users can fine-tune the transition speed and temperature range to suit their personal preferences, ensuring the screen brightness and color balance remain comfortable regardless of the ambient lighting conditions.
- Low System Resource Usage: Built with efficiency in mind, the application maintains a minimal footprint on your system resources, allowing it to run continuously in the background without impacting your computer’s performance or battery life.
- Task-Aware Pausing: The application includes smart detection to prevent color shifts when specific windows or tasks are in focus, ensuring that color-sensitive work remains unaffected while the app is active.
- Portable and Installer Options: LightBulb offers both standard installer packages and portable versions, giving users the flexibility to run the software directly from a USB drive or install it permanently on their system.
What’s New in Current Version
- Refresh cached local time zone so manual sunrise/sunset follows system time zone changes
- Disable CET compatibility in the apphost so the app can launch on older operating systems
- Revert UI unloading, restore persistent main window
- Don’t change paused state when the taskbar or other shell windows are focused
Product Specifications
| Software Name | LightBulb |
|---|---|
| Version | 2.7.3 |
| License | Open Source |
| File Size | 50.0 MB |
| OS Support | Windows |
| Language | English |
| Developer | Tyrrrz |
| Homepage | https://github.com/Tyrrrz/LightBulb |
| Changelogurl | https://github.com/Tyrrrz/LightBulb/releases |
| Last Updated | November 7, 2026 |
How to Install
Installation Steps
- Click the download link for your preferred architecture (x64, x86, or ARM64) to get the installer.
- Run the downloaded executable file to launch the setup wizard.
- Follow the prompts to complete the installation and launch the application.
Compatibility: Compatible with modern Windows operating systems.
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