Installing a Fullbright pack is identical to installing any standard resource pack.
In standard Minecraft, light levels dictate how visible a block is. At light level 0, the screen is virtually black. A Fullbright pack modifies the game’s light map (the file that tells the game how to render shadows) to ensure that every block is rendered at maximum brightness, regardless of the actual light level. Key Benefits: fullbright texture pack 1.12.2