In this one:

light_source
{ <1,1,0>, 1
  looks_like { sphere { 0, .1 pigment { rgb 1 } finish { ambient 1 } } }
}

the sphere is translated by the location of the light source. That is,
this produces a sphere that is located at <1,1,0>.

  In this one:

union
{ light_source { <1,1,0>, 1 }
  sphere { 0, .1 no_shadow pigment { rgb 1 } finish { ambient 1 } }
}

however, the sphere is not translated anywhere (of course), so it produces
a sphere that is located at <0,0,0>.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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