And one Canuck.
As far as radiosity rendering, Archilumos does perform as well as anything. It oprates right out of/within ArchiCAD - the user selects radiosity as an option.
This is a quality solution for ArchiCAD users that can use official lamp luminosity profiles in determining light values.
The challenge is whether an architect should be trying to drive this application. Learning the set-ups for calculating radiosity is very time-consuming since shadows are mapped in polygonal subdivisions adapted to surface variations. I have worked with it for a while experimentally and adjusting this dialog is tricky - failed images displlay staircasing in oblique shadows.
The price is comparable to other radiosity engines and provides direct output from ArchiCAD.
There may be some issues with picture mapping- I have not explored that, yet.