Resource packs are a safe way to achieve the effect without modifying game code. These packs typically adjust light levels or "lightmaps" to ensure everything is rendered at maximum brightness.
: Specifically lists support for version 1.12.2. fullbright for 1.12.2
In Minecraft 1.12.2 , Fullbright refers to any method used to increase the game's brightness beyond the default "Bright" setting, effectively removing all shadows and making caves or nighttime as clear as day. Depending on whether you want to use a mod, a resource pack, or a simple configuration tweak, here are the most common ways to achieve it: 1. The "Options.txt" Trick (No Mods Required) This is the easiest method and works on any version, including 1.12.2, without installing extra software. Step 1: Close Minecraft. Step 2: Locate your Resource packs are a safe way to achieve
If you use any of these, FullBright is built-in: In Minecraft 1