The VRayLightLinker allows you to link lights with surfaces so that only a specific light (or group of lights) illuminates a specific surface (or group of surfaces), or conversely, only a specific object (or group of objects) receive illumination from a specific light (or group of lights).
UI Path: ||Toolbar|| > V-Ray Menu icon > Utility Nodes > VRayLightLinker
Parameters
List type – Sets the way lights are treated by the Light Linker.
Light link – Select which part of the lighting will be affected by the Light Linker.
In this example VRayLightLinker is used to exclude the VRayLightSphere from casting shadows for Sphere 1.