While I don’t know exactly how you’re using them, my understanding is that HDRI spheres are not a supported feature by lumen, and that you’re going to need to use the skylight alone if you want artifact-free rendering.
While I don’t know exactly how you’re using them, my understanding is that HDRI spheres are not a supported feature by lumen, and that you’re going to need to use the skylight alone if you want artifact-free rendering.