If you're tired of stumbling through dark caves or squinting during nighttime PvP, a Fullbright resource pack
Unlike standard texture packs that change the look of blocks, a FullBright pack modifies the light map of the game. It forces the brightness level to its maximum setting internally, effectively giving you permanent "Night Vision." Key Features for 1.8.9 Total Visibility: See clearly in the deepest ravines or unlit tunnels. Performance Friendly: fullbright resource pack 1.8.9
Resource packs alone will give you true fullbright in 1.8.9. If you're tired of stumbling through dark caves
For a dedicated mod file, check out the Fullbright 1.0.0 on Modrinth , specifically built for the 1.8.9 game version. fullbright resource pack 1.8.9