First try at a night time scene with R3.  The light from the left side is a mesh light and there is the top mesh also.  The light underneath the craft is a spot with a cone from the primatives in Poser.  The material is changed to 'null' in the R3 material editor and a volume added.

Total time was just over six hours, dark scenes do take longer, although I was tempted to stop at four hours as the graininess added something to the scene.  I think it was better after four hours but then I am still playing.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.