Trying to get fxLight to flicker

// light datablocks
datablock fxLightData(yellowLight)
{
  FlareOn = true;
  FlareBitmap =  "common/lighting/corona";
  LightRadius = 5;
  RadiusTime = 5;
  AnimBrightness = true;
  AnimRadius = true;
  MinBrightness = "0.8";
  MaxBrightness = "1.0";
  RadiusTime = "1.0";
  BrightnessTime = "1.0";
  BrightnessKeys = "AZM";
  Colour = "0.75 0.65 0.4";
  MinRadius = "2.7";
  MaxRadius = "3.0";
};

function Light_InitTorchLight(%name, %nameTag)
{
   //search for a light of type name and change its colour sequence time
   %position = "0 0 0";
   %radius = 100000.0;
   InitContainerRadiusSearch(%position, %radius, $TypeMasks::StaticTSObjectType);
   
   while ((%targetObject = containerSearchNext()) != 0)
   {
      if (%targetobject.getDataBlock().getName() $= %name)
      {
         if (%targetObject.nameTag $= %nameTag)
         {
            // set random light time
            %obj = %targetobject.getDataBlock();
            changeLightTime(%obj);            
         }
      }
   }
}

function changeLightTime(%obj)
{
   cancel($torchLightSchedule);
   
   // set random light time
   %lightTime = getRandom(50,70);
   %obj.BrightnessTime = %lightTime;
   %obj.RadiusTime = %lightTime;
   
   $torchLightSchedule = schedule( %lightTime, 0,  changeLightTime, %this, %obj);
}