Full [repack]bright Texture Pack 1.12.2 No Optifine -

the file and relaunch the game. Caves and nighttime will now be perfectly bright. Option 2: Resource Packs (No OptiFine Required)

This is where the comes into play.

Fullbright texture packs for Minecraft 1.12.2 allow you to see perfectly in dark environments—like caves or nighttime—without using torches or night vision potions . While many legacy packs for this version require OptiFine for "Custom Colors," there are specific packs and manual methods that work in vanilla Minecraft. fullbright texture pack 1.12.2 no optifine