I commented the steam fog approximation out, so it rendered a little bit 
faster. One sees two instances of the same object (it is the example 
from the tutorials shipped with POV but in a box {-2,2 } instead of a 
sphere). The only difference is

object { Sonne
    scale <500,500,500>*5
    translate MediaPos
}

object { Sonne
    translate <3,1,5>
}

with MediaPos=< 649.685959 , 1442.616855 , 39968.697311 >

Obviously I will not use it in my scene. It's just a riddle I 
encountered by chance. I played a little bit with intervals, samples, 
variance, confidence but without any success. It seems to be due to the 
scaling alone.

Best regards
Michael

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