Hey all, just wanted to flag something.
When a light material is used as a layer in the CoronaLayeredMtl, the light acts as an emissive material rather than a light material.
Disabling "emit light", "visible in reflections" etc, doesn't do anything.
The light continue to emit indirect light, and contribute to volumetrics. Just spent 2 hours converting all my emissive to light mats with "emit" turned off, only to get an identical image with identical noise :D Oh well
Cheers