Most because it’s just gamma change — not X-ray. But some anti-cheat plugins flag extreme gamma as suspicious. Use at your own risk on competitive servers (Hypixel, etc.).
If using OptiFine:
: It can usually be layered on top of other texture packs (like Faithful or Sphax) to keep your favorite visuals while gaining the brightness effect. fullbright texture pack 1.12.2
Here are some tips to help you get the most out of the Fullbright Texture Pack 1.12.2: Most because it’s just gamma change — not X-ray