I was looking really nice in the Live Viewer but when I launch the render (picture Viewer or Render Queue)... the spot light was white only.
Ignoring all the nodes set up I just made.
Figured that if I rebuild it from scratch using only the attribute panel in C4D, the colours are rendering out.
Then, from there, I can modify the look using the node editor... and it's rendering out fine.

Working on Windows using the latest version :
OctaneStudio-for-C4D-2021.1.6-R2-win
AMD Ryzen 7 5800x - 8 core
RTX 3080 Ti