IYou cannot really do "glows" like this but...

I removed "ambient_light 0" and the sphere appears !
then
I made some changes, add a plane to see the "light" spread on a floor...
Try this :

global_settings{
    assumed_gamma 1.0
    //ambient_light 0

      radiosity
      {
        normal on
        pretrace_start 0.08
        pretrace_end   0.01
        count 100
        nearest_count 10
        error_bound 0.02
        recursion_limit 1
        low_error_factor 0.2
        gray_threshold 0.0
        minimum_reuse 0.015
        brightness 1.0
        adc_bailout 0.01/2
    }
  }

plane {y, -1.0 pigment {rgb 0.8}}

camera {
  location <5, 5, 5>
  look_at <0, 0, 0>
  }

union {
  light_source {0.0, 1.0}
   sphere { <0,0,0>, 1 pigment { rgb 1.0 }  finish {ambient 1.0 diffuse 
0.0}}
   }

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