# Tyrrrz/LightBulb

Reduces eye strain by adjusting screen gamma based on the current time

Repository: https://github.com/Tyrrrz/LightBulb
Canonical: https://ross.abutalabs.com/products/lightbulb
Homepage: https://github.com/Tyrrrz/LightBulb/releases
Language: C#
License: MIT
License Family: permissive
Topics: display, brightness, gamma, correction, sunrise, sunset, eye-strain
Last push: 2026-08-03T10:14:11+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 95, release rhythm 72, longevity 100
- inputs: {"age_days": 3520, "days_push": 30, "days_rel": 106, "gap_med": 62.5, "n_releases_24m": 5}
- flags: no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2757, forks 168 (observed 2026-08-28T04:07:18.223538+00:00)

## What it is
LightBulb is a desktop application that reduces eye strain by dynamically adjusting the screen's gamma and color temperature based on the time of day, transitioning smoothly between day and night settings using sunrise/sunset times. It is written in C# and runs as a lightweight tray application.

## Use cases
- reduce eye strain at night by warming screen colors
- automatically dim screen brightness after sunset
- f.lux alternative for windows
- adjust screen gamma based on time of day
- schedule night mode color temperature shifts
- prevent blue light exposure in the evening

## When to choose
- you want an open-source, lightweight f.lux/night-light alternative on Windows
- you need automatic sunrise/sunset-based color temperature transitions
- you prefer a tray app with minimal resource usage

## When to avoid
- you need system-wide color control on Linux or macOS where native tools exist
- you need per-application color profiles rather than global gamma adjustment
- you require HDR display color management

## Facets
- artifact type: application
- maturity: active
- function: configuration-management, developer-tools
- domain: developer-tools, desktop-applications, healthcare
- platform: windows, cross-platform
- tags: eye-strain, screen-gamma, night-light, color-temperature, floss, tray-application, sunrise-sunset, desktop

## Member repositories
- Tyrrrz/LightBulb (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:18.223538+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:18:48.423800+00:00, confidence not recorded.
  - homepage: https://github.com/Tyrrrz/LightBulb/releases (fetched 2026-08-29T09:56:37.522987+00:00, sha 65ea5aeb0b3a)
- Data as of 2026-08-30T08:39:29.467469+00:00.