Help please.

I'm trying to get "clouds" around the light source but instead I get an
almost solid white column + an awful black sheath around that.  I've posted
a complete scene-extract from the below.  This is where I've ended up, but
I'm going mad.

If you can help, please

#include "colors.inc"
#include "textures.inc"
#include "shapes.inc"
camera  {location <200,-800,-10> look_at <0,-600,200000>}
background { Yellow }

//enclosing cylinder
cylinder        {
                <0,0,-10000>,
                <0,0,200000000>,
                2100
                hollow
                texture { pigment { Blue } finish { ambient 0 } }
                }


// Light Source
#declare myCil = cylinder {<0,0,-100>,<0,0,20000000>,.00001};
light_source { x*0 color White*2 looks_like { myCil }  media_interaction on
media_attenuation on}

//media cylinder ( aka headache )
cylinder        {
                <0,-1000,0>,
                <0,2000000000,0>,
                500
                hollow
                texture {
                        pigment {
                                Clear
                                }
                        finish { ambient 1 }
                        }
                interior{

                        media   {
                                samples 10
                                emission 1
                                density {
                                        cylindrical scale 400
                                        density_map     {

                                                        [0 rgb 0]
                                                        [1 White]
                                                        }
                                       warp { turbulence <1,0,0> }
                                        }

                                }

                        media   {
                                absorption .02
                                }
                        }
                rotate <90,0,0>
                }

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