Thanks, friends! 

  The Firefly version is working properly, but the Superfly version's flames don't seem to rise.

  That might be a node coordinate-handling bug;  I'd need to do some diagnostic testing.
But, this will be fairly easy to use.  In the hierarchy panel, you'd click the "eye" icon for the gazebo's built-in 
lamps to hide them.  Load the new add-on prop set.  Oh, and I should make a set of stanchions/flames/lamps for the add-on stairway sections.
Render in Firefly with IDL engaged and pretty high 
irradiance cache and 
IDL quality (=>85 each).  Raytrace bounces =>3.  
Or, render in Superfly with lots of 
mesh light samples (=>15) and overall 
pixel samples (=>20, maybe 40).  Transmission samples =>5, transmission bounces =>8.
For the central light inside, it looks like I need to make something more like a chandelier in order to cast more light over the interior - that will be easy enough.  I figure on a blue flame MC6 preset in addition to the red/yellow color.  Open to suggestions for other colors.