The 1.12.2 Fullbright texture pack is a "quality of life" upgrade that many players find impossible to live without once they try it. It clears up the visual clutter of torches, saves you time during mining sessions, and lets you appreciate the scale of underground builds without squinting.
Select the pack in-game. Crucial Step: Go to Video Settings and ensure your Brightness is set to "Moody" or "Bright" (some packs require one or the other to "kick-start" the effect). Why Use Fullbright Over Night Vision Potions? fullbright texture pack 1.12.2
Look for a reputable .zip file specifically for version 1.12.2. saves you time during mining sessions