Contrary to popular belief, a texture pack (or resource pack) cannot normally change how light levels work. Light is calculated by the game engine, not by textures.
Open the Minecraft launcher, go to "Options," select "Resource Packs," and click Open Pack Folder Move the File: Drag the downloaded file into the folder that just opened. fullbright texture pack 1.12.2 no optifine
Underwater Clarity: Remove the murky darkness of oceans and rivers. Contrary to popular belief, a texture pack (or