This is a simple data pack that utilizes the ambient_light_color attribute in dimension_type/the_end.json. This gives the ambient light a purple-ish hue, however sky_color and sky_light_color are also slightly changed to fit with the ambient light.
This is INCOMPATIBLE with Minecraft versions under 26.1! This is because ambient_light_color was not introduced until this verison.
This does NOT automatically work in multiplayer! You must upload the data pack to your server in order to use it there.
This is a vanilla data pack, so no mods are required. A mod that disables the "experimental settings" warning (such as Experimentalist) is recommended, however.
For 1.21 and lower, if you want a resource pack that changes the end lighting, I made a resource pack called Purple End (with Stars) that does that. The main focus is the custom skybox, but includes other things like emissive textures and pink fire!
