Yes thanks for the information, I’ve indeed seen that MegaLights doesn’t work without RT.
This is the result without MegaLights, PathTracing ON:
And with MegaLights, PathTracing ON:
I see no differences, so even didn’t know if MegaLigts have any effects with PathTracing ON.
Btw just for your information, on the left of this two screenshots I’ve removed some blue niagara effects, because in PathTracing they was making all the scene illuminated with blue light.
But there is no differences if I also deactivated them with Lumen regarding the artifacts.