As far as I can tell, when you create a new light, it doesn't replace the ones already there, it merely adds a new one to the collection. I'm not really clear on what youl're asking. Do you want to know how to delete a light? Click on the light you want to delete, then click on the little trash can next to the lights. That will delete the selected light. I don't think there's any way to delete all lights in one fell swoop, though. I hope this helps a bit. Melanie