Product
About
ScalableLux
A Fabric mod based on Starlight that improves the performance of light updates in Minecraft.
Why does this fork exist?
- Starlight is no longer maintained as a mod since Mar 8, 2024.
- The performance of vanilla lighting engine is still a bottleneck for high-performance chunk generation.
- The base Starlight is still 100% faster than vanilla,
allowing the chunk system to scale beyond 24 threads. - Starlight's "stateless" design allows for parallel light updates, further widening the performance gap.
It is still rather important for dedicated servers with more players to stress chunk generation.
Therefore, it is still important for Fabric or other modded servers with plenty of players.
What does this fork do?
- Contains all the performance improvements from Starlight with additional bug fixes.
- Optionally allows for parallel light updates, bringing significant performance improvement in high-speed
world generation and heavy light updates scenarios.
Environment
Requirements & compatibility
Compatibility & requirements
FabricNeoforge1.21 – 1.21.1126.126.1.126.1.226.2
Local host
Optional
Hosting on services
Optional
Terms
License
Terms for using, modifying and redistributing this product.
GNU Lesser General Public License v3.0 onlyModrinth
Release
Latest release
v0.3.0-alpha.0.8+1.21.1
16.08.2026 · Modrinth
This version is uploaded automatically by GitHub Actions.
Changelog:
- 9ca40b0a Updated Upstream - ishland
Gallery
Project images
Screenshots and images from the original Modrinth page.
No images yet
The project author has not added a gallery on Modrinth.
History
Project versions
Published versions and original Modrinth files.
v0.3.0-alpha.0.8+1.21.1LatestAlpha
16.08.2026 · 18 563 downloads
Neoforge1.21.1
This version is uploaded automatically by GitHub Actions.
Changelog:
- 9ca40b0a Updated Upstream - ishland
v0.3.0-alpha.0.7+1.21.1Alpha
16.08.2026 · 20 140 downloads
Fabric1.21.1
This version is uploaded automatically by GitHub Actions.
Changelog:
- a1c3604d fix: correctly save light correct flag - ishland
v0.3.0-alpha.0.6+1.21.1Alpha
12.07.2026 · 44 652 downloads
Neoforge1.21.1
This version is uploaded automatically by GitHub Actions.
Changelog:
- b95561e9 ci: enable publishing - ishland
v0.3.0-alpha.0.5+1.21.1Alpha
12.07.2026 · 78 565 downloads
Fabric1.21.1
This version is uploaded automatically by GitHub Actions.
Changelog:
- 163c89aa ci: enable publishing - ishland
v0.3.0-alpha.0.18+26.1.2Alpha
10.07.2026 · 5 172 downloads
Neoforge26.1.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- 93842648 fix: remove fmj from jar - ishland
v0.3.0-alpha.0.3+1.21.11Alpha
09.07.2026 · 222 686 downloads
Fabric1.21.11
This version is uploaded automatically by GitHub Actions.
Changelog:
- 876d045a build: backport to 1.21.11 - ishland
v0.3.0-alpha.0.17+26.1.2Alpha
09.07.2026 · 90 downloads
Neoforge26.1.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- d463f53e Updated Upstream - ishland
v0.3.0-alpha.0.2+26.1.2Alpha
09.07.2026 · 116 290 downloads
Fabric26.1.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- e41e4551 Updated Upstream - ishland
v0.3.0-alpha.0.16+26.2Alpha
09.07.2026 · 14 130 downloads
Neoforge26.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- e24f8a50 Updated Upstream - ishland
v0.3.0-alpha.0.3+26.2Alpha
09.07.2026 · 361 319 downloads
Fabric26.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- 77c290c4 fix: add compatibility shims for StarLightLightingProvider - ishland
v0.3.0-alpha.0.16+26.1.2Alpha
05.07.2026 · 272 downloads
Neoforge26.1.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- 6a69c879 build: rebase on backports/26.1.2 - ishland
v0.3.0-alpha.0.1+26.1.2Alpha
04.07.2026 · 12 242 downloads
Fabric26.1.2
v0.3.0-alpha.0.15+26.2Alpha
04.07.2026 · 482 downloads
Neoforge26.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- 49989ca8 fix: git version numbers - ishland
v0.3.0-alpha.0.2+26.2Alpha
04.07.2026 · 29 665 downloads
Fabric26.2
This version is uploaded automatically by GitHub Actions.
Changelog:
- 036ac170 fix: handle cases where Level.getChunkSource return null - ishland
v0.3.0-alpha.0.2+26.2Alpha
03.07.2026 · 164 downloads
Neoforge26.2
v0.3.0-alpha.0.0+26.2Alpha
03.07.2026 · 5 022 downloads
Fabric26.2
v0.2.1+neoforge.729d9d3Release
16.06.2026 · 4 363 downloads
Neoforge26.2-rc-226.2
ScalableLux 0.2.1 for Minecraft 26.2 is released
Changelog:
- Port to 26.2 (26.2-rc-1)
v0.2.1+fabric.2b08348Release
12.06.2026 · 396 662 downloads
Fabric26.2-rc-126.2-rc-226.2
ScalableLux 0.2.1 for Minecraft 26.2 is released
Changelog:
- Port to 26.2 (26.2-rc-1)
v0.2.0+neoforge.cd0897fRelease
24.03.2026 · 23 516 downloads
Neoforge26.126.1.126.1.2
ScalableLux 0.2.0 for Minecraft 26.1 is released
Changelog:
- Port to 26.1 (26.1-rc-2)
- Completely removed Starlight format support
- Improved performance when loading and saving worlds
- Reduced scheduling overhead with proper chunk system integration with C2ME
v0.2.0+fabric.2b63825Release
23.03.2026 · 702 402 downloads
Fabric26.1-rc-226.1-rc-326.126.1.126.1.2
ScalableLux 0.2.0 for Minecraft 26.1 is released
Changelog:
- Port to 26.1 (26.1-rc-2)
- Completely removed Starlight format support
- Improved performance when loading and saving worlds
- Reduced scheduling overhead with proper chunk system integration with C2ME
v0.1.6+neoforge.d31dbcfRelease
01.10.2025 · 29 568 downloads
Neoforge1.21.91.21.101.21.11
ScalableLux 0.1.6 for Minecraft 1.21.9 is released
Changelog:
- Port to 1.21.9 (1.21.9-rc1)
- change: set a size limit for SWMRNibbleArray pool
v0.1.6+fabric.c25518aRelease
26.09.2025 · 3 043 185 downloads
Fabric1.21.91.21.101.21.11
ScalableLux 0.1.6 for Minecraft 1.21.9 is released
Changelog:
- Port to 1.21.9 (1.21.9-rc1)
- change: set a size limit for SWMRNibbleArray pool
v0.1.0.1+neoforge.1cb1e91Release
01.09.2025 · 459 669 downloads
Neoforge1.21.1
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.5.1+neoforge.f7c210fRelease
01.09.2025 · 6 611 downloads
Neoforge1.21.8
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.0.1+fabric.d0d58abRelease
01.09.2025 · 3 079 857 downloads
Fabric1.21.1
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.2+fabric.87468e8Release
01.09.2025 · 387 848 downloads
Fabric1.21.4
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.3.1+fabric.ce1e005Release
01.09.2025 · 159 241 downloads
Fabric1.21.5
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.5.1+fabric.abdeefaRelease
01.09.2025 · 482 484 downloads
Fabric1.21.61.21.71.21.8
A few bugfixes for ScalableLux have been rolled out to multiple Minecraft versions.
Changelog:
- fix: properly implement setLightEnabled and lightOnInColumn (impacts 1.21.4+)
Fixes the issue where a lot of chunk is being wrongly culled in the end dimension
- fix: properly call onChunkReadyToRender (impacts 1.21.4+)
Fixes the issue where only the current chunk section is rendered when first joining the world
- fix: implement LevelLightEngine.getDebugSectionType (1.21.1-1.21.5)
Fixes compatibility for potential backports of voxy
v0.1.5+neoforge.4c941f5Release
17.07.2025 · 4 979 downloads
Neoforge1.21.8
v0.1.5+fabric.e4acdcbRelease
25.06.2025 · 405 024 downloads
Fabric1.21.61.21.71.21.8
ScalableLux 0.1.5 for Minecraft 1.21.6-1.21.7 is released
Changelog:
- Port to 1.21.7 (1.21.7-rc1)
- fix: implement LevelLightEngine.getDebugSectionType for voxy compatibility
v0.1.4+fabric.b88b7b4Release
12.06.2025 · 29 200 downloads
Fabric1.21.6-rc11.21.6
ScalableLux 0.1.4 for Minecraft 1.21.6 is released
Changelog:
- Port to 1.21.6 (1.21.6-rc1)
- Terminally deprecates the starlight lighting format
v0.1.3+beta.1+neoforge.835ef64Beta
31.03.2025 · 8 966 downloads
Neoforge1.21.5
ScalableLux 0.1.3+beta.1 for Minecraft 1.21.5 is released
Changelog:
- Port to 1.21.5 (1.21.5-rc2)
v0.1.3+beta.1+fabric.4039a8dBeta
25.03.2025 · 563 506 downloads
Fabric1.21.5-rc21.21.5
ScalableLux 0.1.3+beta.1 for Minecraft 1.21.5 is released
Changelog:
- Port to 1.21.5 (1.21.5-rc2)
v0.1.0+beta.2+neoforge.1a07a27Beta
01.01.2025 · 323 097 downloads
Neoforge1.21.1
ScalableLux 0.1.0+beta.2+neoforge for Minecraft NeoForge 1.21.1 is released
Fixes a crash.
v0.1.0+beta.1+neoforge.00d9474Beta
31.12.2024 · 370 downloads
Neoforge1.21.1
ScalableLux 0.1.0+beta.1+neoforge for Minecraft NeoForge 1.21.1 is released
Initial port to NeoForge, based on 0.1.0 release.
v0.1.2+beta.1+fabric.6d46f24Beta
22.12.2024 · 434 860 downloads
Fabric1.21.21.21.31.21.4
ScalableLux 0.1.2+beta.1 for Minecraft 1.21.2-1.21.4 is released
Changelog:
- feat: vanilla lighting format rollout
This is a step towards compatibility with mods and tools that interact directly with saved chunks (such as Distant Horizons).
ScalableLux now saves vanilla-compatible lighting data and can read existing vanilla lighting data.
Note: Chunks previously using the Starlight lighting format will be relit in this version.
v0.1.1+fabric.452731dRelease
02.12.2024 · 43 943 downloads
Fabric1.21.21.21.31.21.4
ScalableLux 0.1.1 for Minecraft 1.21.2-1.21.3 is released
Changelog:
- build: port to 1.21.3
- new: experimental support for vanilla lighting format read/write
- fix: minor memory leak in caches (~200MB leak after generating 4 million chunks in one server instance)
v0.1.1+rc.2+fabric.3ed8e44Beta
25.11.2024 · 2 751 downloads
Fabric1.21.21.21.3
ScalableLux 0.1.1+rc.2 for Minecraft 1.21.2-1.21.3 is released
Changelog:
- change: move vanilla format back to experimental
v0.1.1+rc.1+fabric.dac63daBeta
23.11.2024 · 2 590 downloads
Fabric1.21.21.21.3
ScalableLux 0.1.1+rc.1 for Minecraft 1.21.2-1.21.3 is released
Identical to 0.1.1+beta.4 as no major issues were found.
v0.1.1+beta.4+fabric.9c7b699Beta
27.10.2024 · 6 399 downloads
Fabric1.21.21.21.3
ScalableLux 0.1.1+beta.4 for Minecraft 1.21.2-1.21.3 is released
Based on PaperMC/Starlight@cca03d62da48e876ac79196bad16864e8a96bbeb
Compiles against 1.21.3.
Changelog:
- new: implement waitForPendingTasks API for compatibility
- fix: rare skylight saving issues when using vanilla saving format
- fix: minor memory leak in caches (~200MB leak after generating 4 million chunks in one server instance)
v0.1.1+beta.3+fabric.30cf95dBeta
24.10.2024 · 1 671 downloads
Fabric1.21.21.21.3
ScalableLux 0.1.1+beta.3 for Minecraft 1.21.2-1.21.3 is released
Based on PaperMC/Starlight@cca03d62da48e876ac79196bad16864e8a96bbeb
Compiles against 1.21.3.
Changelog:
- fix: vanilla lighting format quirks
- fix: saving issues for starlight format causing lighting to be recalculated when reloading chunks
v0.1.0+fabric.26c6e72Release
24.08.2024 · 1 298 424 downloads
Fabric1.211.21.1
ScalableLux 0.1.0 for Minecraft 1.21 and 1.21.1 is released
The first stable release.
Based on PaperMC/Starlight@cca03d62da48e876ac79196bad16864e8a96bbeb
Code changes from the base:
- build: rebase onto 1.21
- fix: an update mismatch when relighting chunks
- new: add optional parallelism for light updates
v0.1.0+rc.1+fabric.43c9882Beta
20.07.2024 · 43 179 downloads
Fabric1.211.21.1
ScalableLux 0.1.0+rc.1 for Minecraft 1.21 is released
Changelog from 0.1.0+beta.1:
- fix(FlowSched): a rare deadlock in relock notification
v0.1.0+beta.1+fabric.fc82f44Beta
02.07.2024 · 36 202 downloads
Fabric1.21
ScalableLux 0.1.0+beta.1 for Minecraft 1.21 is released
The initial release.
Based on PaperMC/Starlight@cca03d6
Code changes from the base:
- build: rebase onto 1.21
- fix: an update mismatch when relighting chunks
- new: add optional parallelism for light updates
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