Phosphor-Legacy
by Grayray75
Phosphor-Legacy is a Fabric and Legacy Fabric optimization mod that ports JellySquid's Phosphor lighting engine work to Minecraft 1.8.9 – 1.12.2.
What it does
The mod targets one of the game's least efficient areas, the lighting engine, and aims to save CPU cycles so the game runs with less work per tick. It is a port of JellySquid's Phosphor mod for Legacy Fabric, with its code reordered to work with Fabric. Files cover 1.8.9 and 1.12.2, and the latest build is 0.1.5 for 1.12.2, published 2025-12-05. The code is released under the GNU Lesser General Public License v3.0 only, so the source is open.
Key features
Lighting engine optimization
Recalculates light with less processing, reducing CPU work in one of the game's costliest systems.
Phosphor port
Brings the lighting changes of JellySquid's Phosphor mod to the Legacy Fabric code base.
Optional on both sides
Works when installed on a client, a server or both, and neither side needs it.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does Phosphor-Legacy need to be on the server?
Which game versions does Phosphor-Legacy support?
In the catalog
Phosphor-Legacy is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 2,920 mods support Minecraft 1.12.2.
More from Grayray75
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What the author says
Phosphor-Legacy is port of JellySquid's Phosphor mod to Legacy-Fabric. Currently this is just the original 1.12.2 forge code changed in order to work with fabric.
Official listing
- Modrinth page
- modrinth.com/mod/phosphor-legacy
- Owner
- Grayray75
- Published
- 2023-08-12
- Updated on Modrinth
- 2025-12-05
- Facts verified
- 2026-10-15