I'm running POV-beta3.5 RC5 windows on an athlon 1.2ghz.
When you put a spot light inside an object media there is a an strange artifact.

I placed an image 'Spotlight in media' in povray.binaries.image.

There is a work around if you make a spotlight by hand using a open cone and a
point light then the artifact goes away.

This small progam show the problem.

camera{ location <0,8,-15> look_at <0,0,-3> }

light_source{<0,2,8> color rgb 1 spotlight point_at <3,2,12> radius 60 falloff
120}

sphere{0,450 pigment {rgbt .5}
     interior {media{ emission<.1,.2,.3> absorption<.4,.4,.4> }}
 no_shadow hollow}

//ground
box{<-80,0,-80><80,-1,80> pigment{checker rgb 1 rgb<1,0,0>}}




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Have Fun!

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