I made one more color maps so you can see what for direction are in the standard poser scene and where the light come from using light probe, if this is not enough prove for you then i dont know how to tell you.. the blue color is what come from the begind the north that why is not visible blue light on the ball.. and this make a big sense...

Light Probe that light up the scene in Poser is based on the Latitude/ Longitude sphere map that is very important to show exactly where the scene will be lighted up.. the ground, the sky or the left or right sides.. the red would be for the right hand for us in real world also for the models in the poser scene mean the west, the yellow for the left side..etc... so simple is that 

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"Surrender to what it is - Let go of what was - Have faith in what will be "