Why is it that when I increase the radius and falloff of a spotlight at
a certain point well before 90 degrees the light appears the same;
version is 3.1g.watcom.win32.  It was my understanding that both radius
and falloff could range up to 90 degrees.


#version 3.1;

global_settings { assumed_gamma 2.2 }

camera {
  location <0, 1, -3>
  look_at  <0, 1, 0>
}

light_source {
  <-2, 1, 0>
  rgb 1
  spotlight
  point_at <-2, 1, 6>
  radius 60
  tightness 50
  falloff 65
}
light_source {
  <2, 1, 0>
  rgb 1
  spotlight
  point_at <2, 1, 6>
  radius 30
  tightness 50
  falloff 35
}

plane {
  z, 6
  hollow on
  pigment { rgb 1 }
}

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