Hello, the newer versions of this mod do not work with Radiant Gear, whereas previous versions do.

The last known version to work with Radiant Gear is version 1.60 from 9/1/2023.

Same problem here on forge 47.3.0 1.20.1: https://www.curseforge.com/minecraft/mc-mods/radiant-gear

the old version is very out of date with upstream LambDynLights, so the API has changed. Any mod supporting the old API will need to be updated to support the new one