ModsJava
Area Light Up
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
Automatically places torches in dark areas to prevent mob spawning. Preview scan, survival inventory support, and grid-based placement for efficiency.
⬇ Download on ModrinthLightUp
Automatically places torches in dark areas within a radius around the player to prevent mob spawning. Uses an efficient grid-based placement system.
Commands
| Command | Description |
|---|---|
/lightup |
Preview with default radius (64 blocks) |
/lightup <radius> |
Preview with custom radius (8-128 blocks) |
/lightup stop |
Stop the current task |
/lightup help |
Show all commands |
Features
Preview System
Before placing any torches, the mod scans the area and shows:
- Torches needed with stack breakdown (e.g., "3840 (60 stacks)")
- Inventory comparison (survival mode)
- Crafting materials if you're short on torches
- Click [START] to begin or do nothing to cancel
Game Modes
| Mode | Who | Behavior |
|---|---|---|
| OP Mode | Players with permission level 2+ | Unlimited torches |
| Survival Mode | Regular players | Uses torches from inventory |
How It Works
- Creates a grid of positions every 12 blocks apart (torch light reaches 14 blocks, ensuring overlap)
- Places ONE torch per tick to avoid server lag (~10 torches/second)
- After grid completion, does a cleanup scan for any missed dark spots
- Progress updates every 50 torches
Torch Placement Validation
A position is valid if:
- Position is air
- Block above is air (prevents underwater placement)
- Block below is solid
- Block light level is 0 (actually dark)
Technical Details
- Minecraft: 1.21.11
- Mod Loader: Fabric
- Dependencies: Fabric API
- Source: GitHub
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.11
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as lightup-1.3.1.jar — drop this file into the mods folder
- Download size: 16 KB
- Download link checked 16 Oct 2026 — working
These come from our own check of the pack file, not from the source page.