Here it is with scattering so shadows show up in the light beam.
Admittedly, I don't know geometry well enough to keep the distance and width
of light beam in sync.  Must be a formula for keeping angle relative to the
cone apex height and base diameter ratio.
BTW, this was fairly quick for me to render.

#declare F=1.333; // fudge factor
#declare D=10*F; // distance
#declare S=5*F; // scale

#declare ConeOfLite=
cone {
        0,0,y,1
        pigment {rgbt 1}
        interior {
                media {
                        emission 1/3/S // intensity of air glow
                        scattering {1,0.2}
                        density {
                                cylindrical
                                }
                }
        }
 scale <S,D,S> // x and z are width, y is length or distance
 hollow
}

light_source {
  0, 1
  spotlight
  point_at y
  radius 6*S
  falloff 12*S
  looks_like {ConeOfLite}
 rotate <120,90,0> translate <-3,2,0>
}

plane {y,-1
        pigment {rgb <.9,.6,.3>}
}

sphere {0,1 pigment {rgb .5}}

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