I just discovered a strange side effect with the 'shadowless' lights.
  Try this:

camera { location -z*5 look_at 0 angle 35 }
light_source { <100,100,-100>,1 }
sphere { 0,1 pigment { rgb <1,0,0> } finish { specular 1 } }

  A regular sphere with a highlight.
  Now apply the keyword 'shadowless' to the light source.
  The highlight disappears!
  This works equal in both pov3.0 and 3.1. It also works if the highlight is
a phong highlight instead of a specular one.
  Is this a bug? Should I report to povray.bugreports?

-- 
main(i){char*_="BdsyFBThhHFBThhHFRz]NFTITQF|DJIFHQhhF";while(i=
*_++)for(;i>1;printf("%s",i-70?i&1?"[]":" ":(i=0,"\n")),i/=2);} /*- Warp. -*/

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