Generally allowed, as it acts like a client-side brightness tweak.
The Fullbright mod (often referred to as "Gamma Boost" or "Night Vision") is a client-side utility mod that removes the darkness gradient from the game. In vanilla Minecraft, the darkness level (gamma) is capped to prevent players from seeing clearly in total darkness. Fullbright removes this cap, allowing you to see in caves, at night, and underwater as if it were a bright, sunny day.
Launch Minecraft using the profile (not Vanilla). Upon loading into a world, you should immediately notice that caves are as bright as the surface. No toggling required. File name- Fullbright-Mod-Fabric-1.21.4.jar
At its core, this file name points to a client-side Minecraft mod designed to solve one of the game's most persistent nuisances: the darkness in caves, at night, and in other low-light environments. The goal is simple—to adjust the game's gamma and brightness settings, banishing shadows so you can see every block clearly.
When the world appeared, the first thing he noticed was the clarity. Caverns that had once swallowed him in an oppressive fog were revealed in clean, steady light. Shadows softened into dependable edges. Gravel that used to betray him now lay plain and innocuous. His character's torch, still in his hand, was suddenly decorative rather than necessary—an amulet from a different era. Generally allowed, as it acts like a client-side
Select the profile from the drop-down menu.
To use this mod, you must have the and Fabric API installed for Minecraft version 1.21.4. Fullbright removes this cap, allowing you to see
: The core functionality. It boosts ambient lighting to maximum capacity.
: Most versions use a dedicated keybind—typically 'B' or 'G' —to instantly switch between normal brightness and full illumination.
Most server owners consider Fullbright unfair because it negates the need for torches, removing a survival mechanic. However, it is rarely bannable unless the server explicitly lists "Gamma Boost" or "Brightness Mods" in its disallowed modifications section.
This is the most debated aspect of gamma-boosting mods.