Here’s a helpful breakdown of the file .
, this file is safe and useful for exploring dark areas without spamming torches. Just keep a backup of your original options.txt file in case you want to revert to normal lighting. 💡 Pro tip: Many fullbright mods work by pressing a key (e.g., F or G ) to toggle the effect. Check the mod’s description for its keybind. File name- Fullbright-Mod-Fabric-1.21.4.jar