Aloha 4space,
If it is in your house you can (nicely) tell them it is your house and they need to leave. They don't need to go to the light, bu they need to leave. If it's someone else's house, then they need to tell the ghost to leave during the process.
If you're in Australia, like Alex - you send a kangaroo after them (just kidding)
Much Love, Shawn
