PS>     I have find that the best way to make visible light is to use
 PS> conical shaped bright objects. I use linear texture to augment
 PS> transparency along the y axis, so the cone is semi-transparent
 PS> (160-160-160) at the source and full transparent (255) at the end.

 CB>     In addition, you could use the Ghost or Fakely textures; they
 CB> would give you more control over the transparency falloff. This is
 CB> off the top of my head, BTW; I haven't actually tried it to see if
 CB> it gives better/worse results than plain ole fog.
 
 PS>     One thing that I have done is to use FilterNoize applied on a
 PS> parent axis, with "Apply to children".  When I rotate the light
 PS> cone, I do not move the parent axis.  This way, you will see the
 PS> light beem moving in an immobile cloud of irregular smoke or fog.
 PS>     One of the problem I encoutered is that Filter Noise seem to
 PS> override the linear transparency setting, so the beem do not appear
 PS> to vanish as it come farther from the light source.

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