Checked again and there is no light module for beams. Not very experienced with Cascade so maybe I just missed it, but I checked a few times now (unless it’s in some submenu I missed).
As for light going from source to target, I didn’t find any such feature, but as above, I might just not have found it.
Also a clarification for the thread title which I worded badly: I mean that the beam itself would emit a light or particle, not that a point light or particle would travel up and down the beam.