If you don't want to mess with game files, a texture pack is the easiest route. How To install X-ray mod 1.5.2 Download
Toggles Fullbright/Light, making caves visible without torches. minecraft 1.5.2 xray
Most 1.5.2-era X-ray mods shared a common set of hotkeys that many veterans still remember: Toggles the main X-ray vision. If you don't want to mess with game
Before Forge became the absolute standard, many players installed mods by editing the minecraft.jar file directly. and even a basic "Redstone Finder".
These are functional modifications that alter the game's code. In 1.5.2, they often included extra perks like a "Fullbright" (Night Vision) toggle, coordinate displays, and even a basic "Redstone Finder".