Hi,

I have activated radiosity with the default settings and modified my plasma:
union{
        sphere{ 0,1
                pigment { rgbt 1 } hollow
                interior{
                        media{
                                emission 6
                                density{
                                        spherical density_map{
                                                [0 rgb 0]
                                                [0.1 rgb <.5,.1,.5>]
                                                [0.2 rgb <1,.8,1>]
                                                [1 rgb 1]
                                        }
                                }
                        }
                }
        }
        light_source{0 color rgb<1,0,1> area_light 0.6*x 0.6*z 5 5 circular
        orient adaptive 0}
        scale <0.4,.5,.4>
}

The results are now way better. I will check the other advices next week.

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