Can I use RoomBox with Lumion?

Absolutely!

RoomBox cannot directly create Lightmap materials for Lumion, but it's easy to set them up:

1. Select a room material, and set it as a Lightmap material

2. Click on the Choose Lightmap Texture icon button

3. Navigate to C:\Users\USERNAME\AppData\Roaming\RoomBoxForSketchup\downloads (or the download folder if you specified another one in the RoomBox settings)

4. Select the PNG map of the room. Choose the file ending with ..._converted.png

5. Increase the Lightmap and Lightmap Multiply sliders to 1.0, or adjust to your liking

6. Repeat for the other room materials