Core Shaders, Vanilla-like

If you want to use Fullbright in Sodium, there is now an extra version for this: https://worldresourcepack.com/resourcepack/fullbright-sp

Fullbright UB Resource Pack: Elevate your Minecraft experience with the Fullbright UB Resource Pack. Say goodbye to darkness and immerse yourself in a world filled with clarity and light, optimized for Vanilla, Sodium (with PolyTone), and Optifine. Features:

Enhanced Visibility: Illuminate your surroundings without relying on torches or other light sources. Enjoy clear visibility even in the darkest corners of Minecraft.
Compatibility: Fully compatible with Vanilla, Sodium (with PolyTone), and Optifine, ensuring optimal performance and enhanced visibility across all platforms.
Immersive Atmosphere: Experience Minecraft in a whole new light with enhanced visibility. Explore caves, forests, and nightscapes with ease.
Performance-Friendly: Enjoy improved visibility without compromising performance. Experience smooth gameplay without any lag or delays, regardless of your preferred Minecraft modifications.
Easy Installation: Installing the Fullbright UB Resource Pack is straightforward. Simply place the files in your resource packs folder and activate it in-game. It’s that simple!

Conclusion: The Fullbright UB Resource Pack is a must-have for any Minecraft player seeking enhanced visibility and a brighter gaming experience across Vanilla, Sodium, and Optifine platforms. With its easy installation, customizable brightness, and performance-friendly design, this resource pack transforms your Minecraft world into a luminous paradise.