If you prefer not to use a resource pack or OptiFine, you can achieve a similar "Fullbright" effect by modifying Minecraft's configuration files directly: Close Minecraft completely.
Launch Minecraft version 1.12.2 (ensure you select your OptiFine profile). fullbright 1.12.2 resource pack
and competitive survival, FullBright provides a distinct tactical advantage. Nighttime and unlit interiors usually offer cover for stealthy players; however, a user with this resource pack sees their opponents as clearly as if they were standing in broad daylight. This has led to a long-standing debate within the community regarding "fair play," with many servers categorizing FullBright as a "quality of life" tweak, while others view it as a borderline Aesthetic Sacrifice for Performance If you prefer not to use a resource
Day 6 — Packaging, distribution, and cross‑version notes Nighttime and unlit interiors usually offer cover for
The Fullbright 1.12.2 resource pack is an essential tool for anyone looking to optimize their mining, building, or adventuring experience. It removes the tedious aspect of lighting up caves, allowing you to focus on what matters—finding that diamond ore or building your next massive underground base.
Look for highly-rated custom light map packs.