Began testing with all white pigment and default finish settings.  Made 
some  monochrome changes to the pigments, added different finishes and 
normals.  This is basically the OutdoorLQ settings from rad_def.inc with 
the count boosted 50% to 120.

The light-generating sphere is this:

sphere { 0, 2000 hollow
         pigment { average
                 pigment_map {
                        [ 1
                                 gradient y
                                 pigment_map {
                                         [ 0 rgb  20 ]
                                         [ 1 rgb -25 ]
                                 }
                                 scale 4000
                                 rotate x*180
                                 translate <0,-2000,0>
                        ]
                        [ .5
                                 spotted
                                 pigment_map {
                                         [ 0 rgb   25 ]
                                         [ 1 rgb  -15 ]
                                 }
                                 scale 900
                        ]
                 }
         }
}
The first image, "956", is under v 3.5  the second, v 3.6

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