If you don't want to use a resource pack, you can achieve the same effect via: Xray Ultimate 1.12 compatible - Resource Packs
In the Minecraft menu, move the pack to the "Selected" column and click Alternative: Console Commands night vision resource pack 1.12.2
: This pack provides clearer sight in dark areas while maintaining a subtle visual indication of nighttime when you are underground. If you don't want to use a resource
: For best results, set your in-game brightness to "Bright" (gamma 1.0). night vision resource pack 1.12.2