I*'ve have tried several permutations of your settings (the renders do not
take long at 320*240) but to no avail.

An example of the settings I've tried is:

box { <-10, 0, -10>, <9,10,15>
           pigment { color rgbf <1,1,1,1> }
           interior { media {   scattering {3, 0.02}
                                         intervals 20
                                         samples 1,10
                                         method 2
                                    }
                         }
           hollow
    }

I can't see any change except for the scene being darker, my light sources
are:

light_source { <0, 10, 0> color White
               spotlight radius 25 falloff 35 tightness 10 point_at <0, 2,
0>
               media_attenuation on
             }
light_source { <1000, 1000, 750> color rgb <1.0, 1.0, 1.0>
                media_attenuation on
               }
light_source { <1.9, 3, 13> color rgb <1.0, 0.9, 0.9>
                fade_distance 2.5 fade_power 0.
                media_interaction off
             }
light_source { <5, 5, 7.99> color rgb <1.0, 0.9, 0.9>
               fade_distance 1.5 fade_power 1
               media_interaction off
             }
light_source { <7.89, 5, -2> color rgb <1.0, 0.9, 0.9>
               fade_distance 2 fade_power
               media_interaction off
             }

if I set the final three lights to media_attenuation on (opposed to
media_interaction off) then these get huges pure white halos that dominate
most of the scene.  For the first two lights do i need to set
media_interaction on or anything?  or is media_attenuation on sufficient?

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