I just happened to realize a slight mistake in a comment added to the example 
scene I posted earlier, shown in part below.
media_interaction is on by default alright; however not so for 
media_attenuation, which is needed for light falloff caused by fogs or 
atmospheric effects, else it defaults to off.

Message <36646202.0@news.povray.org>, =Bob typed...
>
>
>light_source
>{  0*x   color rgb<3,2,1> //intense reddish light
>  fade_distance 1 fade_power 2  //cause falloff of light
> //neither of these media_ statements are needed unless turning off
>// media_attenuation on media_interaction on
>}
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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