I've followed instruction in several posts to isolate and turn off the Revit Light Source objects which I've executed with much success. However...I've run into a glitch. I received a Revit MEP file with lighting fixtures that contain Light Sources that cannot be isolated. They are not assigned the Default Light Source material and when I select the geometry in Navis it is tied to the associated light fixture. Furthermore, when I try to edit the families I can't delete the Light Source. I've attached a screen cap of the lights in Navis with these odd tumors hanging from them. Any thoughts???