I was looking at the two replies posted to my message and as far as I can see
Ken explained the situation even better than I could; but he stopped just short
of a suggestion to fix the problem.

there is nothing special about the source, I am using the std seen file and
just and std texture for glass and a switch to toggle on an off the photones.

here is the source:


// Persistence of Vision Ray Tracer Scene Description File
// File: ?.pov
// Vers: 3.1
// Desc: Basic Scene Example
// Date: mm/dd/yy
// Auth: ?[esp]
//

#version 3.1

#include "colors.inc"
#include "glass.inc"

#declare phd=1.0;  // lower this value for a higher density (better
                   //   quality render)

#declare phon=0;  //turn pgotons off or on (0/1)

global_settings
{
  assumed_gamma 1.0
  max_trace_level 20
  #if (phon)
    photons{
    gather 20,100
    radius 0.1*phd, 2, 0.1*phd
    autostop 0
  }
  #end

}

// ----------------------------------------
camera
{
  location  <0.0, 0.5, -4.0>
  direction 1.5*z
  right     4/3*x
  look_at   <0.0, 0.0,  0.0>
}

//sky_sphere
//{
//  pigment
// {
//    gradient y
//    color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
//  }
//}

light_source
{
  0*x // light's position (translated below)
  color red 1.0  green 1.0  blue 1.0  // light's color
  translate <-30, 30, -30>
}

// ----------------------------------------
plane { y, -1 pigment {color rgb <0.7,0.5,0.3>}}


#declare ball = sphere
      {<-.7,-0.3,0>, 0.4
         texture {T_Glass3}
         interior{ior 1.5}
           #if (phon)
           photons{
                   density 0.01*phd
                   reflection on
                   refraction on
                  }
           #end

       }

#declare cnt=0

#while (cnt < 5)
       merge {
       object {ball
               translate <cnt/2.5,0,0>
              }
       #declare cnt=cnt+1
       }
#end

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