I think it's the light you have to work on to have the falloff...
light_source {
  <0.0, 0.0, 0.0>
  color rgb <0.0, 1.0, 0.0>
  media_attenuation on
  media_interaction on
  fade_distance 100
  fade_power 1
}

or something like that...

             David (did something like you but don't remember where it is to
check...)

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