You could add real Geometry before the light, to block it.
I don't think you can do this on the lamp level in ArchiCAD.
--- stefan boeykens --- bim-expert-architect-engineer-musician --- Archicad28/Revit2024/Rhino8/Solibri/Zoom MBP2023:14"M2MAX/Sequoia+Win11 Archicad-user since 1998 my Archicad Book