Understanding the “Fullbright” Resource Pack for Minecraft 1.12.2
For version 1.12.2 specifically, note the following critical requirements: FullBright - Minecraft Resource Packs fullbright 1122 resource pack full
Creators like Beyonderboi developed specific versions for 1.11 through 1.12.2 that modified internal lighting values without requiring heavy mods. fullbright 1122 resource pack full