> web.42b69f52a6ab8cf34f17dd8d0@news.povray.org

Thanks for that.  However I'm not sure that my problem is the same as
Burki's, or at least the solution isn't the same.  He had artefacts in
conical spotlights; I'm getting them at the origin of cylindrical
spotlights, the beams of which travel only a couple of units before
striking an object.  It looks like the light is emanating from a black
saucer.

I have limited the media thus:

box {-2 2
  hollow pigment{rgbt 1}
  interior {media { scattering { 2, rgb 1/2 extinction 0} samples 50}}
}

....with no improvement.

Thanks for your help so far.  I wonder if I could trouble you for some more
:-)

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