A quick and dirty try to get the spark to emit light.

I tightened the spark and added a bunch of lights to it.
The cylinders in the background are just to give an idea about the shadowing
on the back wall.

You may have to play with the "Spark_Light" settings to get the effects you
want.

#declare Discharge_Spark = 
object{
  cylinder { <-1,0,-10>, <1,0,10>, 4}
    hollow pigment { Clear }
    interior {media{method 3    // 3
    aa_level 4                  // 4
    aa_threshold 0.1            // 0.1
    samples 16, 100             // Min 1, Max 1
    intervals 1                 // 10
    ratio 0.9                   // 0.9
    confidence 0.9              // 0.9
    variance 1/128              // 1/128
    jitter 0
    emission <10,10,12>         //High values obscure the core
    density {cylindrical
       rotate x*90
       color_map { [ 0.00 Black ]
                   [ 0.60 rgb <0.15, 0.4,1.0>*0.02]
                   [ 0.94 rgb <0.15, 0.4,1.0>*0.1]
                   [ 0.97 rgb <0.05, 1.0,0.05>*5] //Accent
                   [ 0.98 rgb <0.15, 0.4,1.0>*0.2]
                   [ 0.99 rgb <0.15, 0.4,1.0>*60]
                  }
     warp{turbulence<0.1,1,0.1>         // amount of turbulence
          octaves 8                                              // 10- too much 
       // optional turbulence modifiers
          lambda 5 // 10 is "grainy"
          omega 0.2 //0.1 sinuous 0.9 chaotic
         }
         }
        }
      scale<2,2,1>
      }
                
#macro Spark_Light(Start,End,NumOfLights,TotalBrightness,FP,FD) 
#local Distance = (End - Start) / NumOfLights+1;
#local Brightness = TotalBrightness / NumOfLights;
union {
        #local Count = Start+Distance;
        #while (Count <= End-Distance)
                light_source { 0 color rgb<0.15, 0.4, 1.0> * Brightness translate
<0,0,Count> fade_power FP fade_distance FD }
                #local Count = Count + Distance;
        #end
        }
#end

// Overhead lights
light_source { 0 color rgb 0.75 translate < -30 , 100 , 0 > }
light_source { 0 color rgb 0.75 translate < 30 , 150 , 0 > }

        
#declare Spark_Terminal =
union {
        sphere {<0,0,-20>,4}
        sphere {<0,0, 20>,4}
        cylinder {<0,0,-20>,<0,-40,-20>,1}
        cylinder {<0,0, 20>,<0,-40, 20>,1}
        cylinder {<0,0,-16>,<0,0,-12>,1}
        cylinder {<0,0, 16>,<0,0, 12>,1}
        difference {
                        sphere {<0,0,-14>,4}
                        cylinder {<0,0,-20>,<0,0,20>,2 inverse}
                        plane { z , 0 translate <0,0,-12> }
                        }
        difference {
                        sphere {<0,0, 14>,4}
                        cylinder {<0,0,-20>,<0,0,20>,2 inverse}
                        plane {-z , 0 translate <0,0, 12> }
                        }
//      cone {<0,0,-12>,2,<0,0,-10>,-0}
//      cone {<0,0, 12>,2,<0,0, 10>, 0}
        texture { T_Gold_3A }
        }
        
#declare Kaboom =
union {
        object { Spark_Terminal }
        object { Discharge_Spark }
        Spark_Light(-10, 10, 150, 500, 1.25, 2)
        translate < 0 , 10 , 0 >
        }
        
camera {
        location <40 , 14 , 20 >
        look_at < 0 , 8 , 0 >
        }


plane { x , -40 pigment { Gray70 } finish { Shiny}}
plane { y , 0 pigment { Gray50 } finish { Shiny }}
cylinder {<-25,0,5>,<-25,12,5>,5 texture { Polished_Chrome }}
cylinder {<-25,0,-15>,<-25,18,-15>,10 texture { Polished_Chrome }}

object { Kaboom }


-- 
Ger

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