Tips on rendering caustics in Blender 2.4x using Sunflow

Hello,

Unfortunately I don’t know a lot about GI/rendering, so could use any tip/advice.
Been playing with reflected light(literally) recently and got a caustics type of light:

I would like to simulate something like that in Blender and Sunflow.
Am using Blender 2.4x because there’s an existing Sunflow exporter for it.
I imagine a basic setup would be:

  • a box(room)
  • a main(dimmed) light
  • a projected light (doesn’t need to have a pattern)
  • a shiny/reflective material for the ‘reflector’ mesh
  • a basic material for the walls.

I’m not entirely sure if this setup will work to get the caustics. Hints ?