Ray Start Offset Depth Scale
The Ray Start Offset Depth Scale controls the ray starting point for the Ray Traced Shadows for a receiving surface, as the camera moves farther away. It helps to prevent self-shadowing artifacts that appear from low-resolution Mesh Distance Fields, or from meshes that have complex geometry which can’t be reasonably captured in a volume texture.
In some cases, adjusting the Mesh Distance Field quality can reduce or remove these artifacts, without adjusting where the ray starts. Keep in mind that you may not want to pay the higher memory cost the generated volume texture would require. Ray Start Offset Depth Scale can help curb that cost for this light.