Vanilla Feel: It keeps the game engine untouched while only changing the visual data the game receives. Key Features of the 1.12.2 Pack
If you don't want to download anything, you can manually set your brightness past the "Bright" (100%) limit in your game files: Close Minecraft completely. Navigate to your .minecraft options.txt file with a text editor. Locate the line that says (or similar). Change the value to fullbright texture pack 1.12.2 no optifine
