Okay, thanks for the input, here's another sample that shows what I think is
odd behaviour:

Am I right in assuming that my light beam will be no bigger than Beam_Width?
If that is the case (and even if not, I think)  then the bottom of the beam
is enclosed entirely by the shade, and so the black shadow should be
covered, no?

This was supposed to be a simple scene to fill in the beginning of a movie
we made :(  This light stuff is really stumping me.


The actual lamp part of the image is:

  #declare Beam_Width=0.06;
  #macro FloodLight(Direction, Position)
    union{
      cylinder{0, Beam_Width*1.1*y, Beam_Width*1.1}
      sphere{0, Beam_Width*1.1}
      rotate Direction
      translate Position
      texture{Tex_Base}
      no_shadow
    }
    light_source{
        0 color rgb <0.7, 0.7, 1>*15
        cylinder
        point_at 10*y
        radius Beam_Width*0.9
        falloff Beam_Width
        tightness 0
        rotate Direction
        translate Position}
  #end

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