Disable lighting for specific actors? (lighting groups)

How do you turn off specific lights for specific objects? In UDK you had lighting groups, but I haven’t been able to find it (or the equivalent) here. I need to make sure my object (skybox) doesn’t receive light or cast shadows (latter is done) over the landscape

Were you able to figure this out? I’d like to know as well.

You cannot, due to deferred lighting.