The Fullbright mod, while straightforward, can significantly enhance your Minecraft experience, especially if you're someone who prefers a brighter game world or needs to play in well-lit conditions for building or exploration purposes.
. While often referred to as a "mod," it is also commonly implemented through resource packs or manual configuration edits. Core Functionality fullbright 1.12.2 mod
Look for the Fullbright (or "Brightness Override") .jar file specifically for 1.12.2. The Fullbright mod