This Revit add-in doesn’t support Autodesk Revit LT versions.
It becomes difficult to seamlessly transmit the materials of your Revit model into Lumion through a normal FBX export.
This Revit add-in is considered as a perfect tool inside your Revit program to bring your Revit model into Lumion. The plugin can easily export any 3d view according to your choice as a collada file that can be imported into Lumion.
Link for download Revit exporters add-on