>BTW, is your "sorcery" a secret? Or did you scale down the brightness to
>within the 0 1 range and postprocess?

You can avoid the postprocess.  Just wrap a tiny sphere around the camera
with the following attributes:

  pigment {rgbf <BRIGHTNESS,BRIGHTNESS,BRIGHTNESS,1>}
  finish {ambient 0 diffuse 0}
  no_shadow no_reflection hollow

....and the brightness of each pixel will be multiplied by BRIGHTNESS.  So
set BRIGHTNESS to 20 or so, divide all your lights' colors by BRIGHTNESS,
and you get a nice image.  Radiosity seems to get slower as BRIGHTNESS
increases, though.

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