Lighten Up, Chunks!
by deanxbox
Lighten Up, Chunks! is a server-side Fabric tool that relights chunks which were generated before their lighting data was saved correctly.
What it does
Worlds sometimes show black, unlit chunks or dark patches after an older save, a modpack change or a damaged lighting table. The mod rebuilds the lighting of those already-generated chunks, so players do not have to walk through the affected terrain by hand. Corrected lighting is written to disk in bulk, and the updated chunk and light state is sent to connected clients. Long-distance renderers such as Voxy also benefit, since they depend on correct light data in distant terrain.
Work runs over a whole world, over a targeted region, or within a radius around a point, and progress is tracked in a boss bar with configurable details. Its commands follow the style of Chunky, so server owners familiar with that tool will find the syntax close. The mod requires Fabric API and can be configured through Mod Menu when that is installed. It works in singleplayer as well as on servers.
The code is open source under the MIT License. Builds exist for 1.21.11, 26.1, 26.1.1, 26.1.2 and 26.2 across five release versions, and the latest Fabric file is 1.3.0+26.3 for 26.3, published on 2026-10-15.
Key features
Whole-world relighting
Every explored chunk in a world can be relit over time, without the player visiting each area.
Region and radius scans
Relighting can be limited to a chosen region or to chunks within a set radius of a position.
Bulk disk writes
Corrected lighting is saved to disk in batches rather than one chunk at a time.
Live client updates
Updated chunk and light state is sent back to connected clients so the change shows without reloading.
Progress boss bar
A boss bar shows how far a scan has progressed, and the displayed information can be configured.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 1
How it compares
Voxy Server is client and server, open source under the GNU Lesser General Public License v3.0 only, and runs on Fabric for 1.21.11 – 26.2, so it serves distant terrain rather than fixing light data. Disable Lighting is client-side only, CC0 1.0 Universal and open source, for 1.21 – 26.3, and it removes lighting from the client without changing saved chunks. Voxy Server Side is client and server, MIT licensed and open source, and covers Fabric and NeoForge for 1.21.1 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Lighten Up, Chunks! | Fabric | 1.21.11 – 26.2 | Server-side only | 2026-08-13 |
| Voxy Server | Fabric | 1.21.11 – 26.2 | Client and server | 2026-07-26 |
| Disable Lighting | Fabric | 1.21 – 26.3 | Client-side only | 2026-09-29 |
| Voxy Server Side | Fabric and NeoForge | 1.21.1 – 26.3 | Client and server | 2026-10-14 |
Questions
Does Lighten Up, Chunks! need Fabric API?
Does every player need the mod installed?
Can the mod be used in singleplayer?
Is Mod Menu required to change settings?
In the catalog
Lighten Up, Chunks! is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 13,894 mods support Minecraft 26.2.
More from deanxbox
Similar mods
What the author says
Lighten Up, Chunks! is a Fabric mod for rebuilding lighting in already-generated chunks. It’s designed for worlds where saved light data is missing, broken, or stale, causing black chunks, dark patches, or incorrect long-distance rendering in tools like Voxy. Instead of requiring players to manually travel through…
Official listing
- Modrinth page
- modrinth.com/mod/lighten-up-chunks
- Owner
- deanxbox
- Published
- 2026-03-29
- Updated on Modrinth
- 2026-08-13
- Facts verified
- 2026-10-15