Vray Light Exclude Railclone

I have a scene with multiple vray dome lights using HDRI. I am trying to exclude some railclone objects from one of the lights however, this does not work. The objects are lit using all lights no matter how I adjust the settings. The only work around I have found is to use the railclone tools - instantiate and convert into a mesh, which isn’t always feasible.

Please could you let me know if there is another way of excluding railclone objects from the light or if this is a bug in the software. If it is a bug please could this be looked into and fixed.

Thanks

Can you try disabling “Use Instancing Engine” in the Render rollout of the Railclone object. I have noticed some things not working properly (like triplanar / uvw randomizer) when this has been enabled.