Here it is an extract from a discussion between Charles Blaquiere and P.Sauvageau:
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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