Additional afterthought:

I think that you will obtain the best results by always defining the 
object at the origin and with unit scale. Only at the end of the built 
do you scale the object and translate it to its correct position. This 
is how it is done in the file candle_flame_4.pov .

Note: particularly when using scattering media, you need to divide the 
scattering by the used scale for the object in order to keep the same 
results. This is explained in the docs btw. For instance:

sphere {0, 1
   pigment {rgbt 1}
   hollow
   interior {
     media {
       scattering {1, <0.5,0.4, 0.3>/MyScale}
     }
   }
   scale MyScale
}

I am not sure, but I think this gives also better results with emission. 
With density, it is more complicated and you have to experiment.

Thomas

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