Attached Link: http://www.bryceworks.com/b31gall/trees.html

If I understand you correctly - that just gives the Light Object itself a volumetric texture. If you want to get a Volumetric light "beam" you have to shine it through the Sky Lab Volumetric World or through a primitive with a Volume texture surrounding the light/camera/scene. The URL above shows an old Bryce 3.1 image thats show light beams in a VWorld. HTH- Dan