BB.. my dia are based on the poser scene and the rules of the world .. not the panoramic wrong merged images you use that confuse you... go make yourself a correct panoramic image and come back with the test.. I do that for years..piblished in a book... so  don't have to do that again, my light always shine from the right place and position... my customers got always the lights shining from the sides I tell them where it come from so.. i can talk to you until we get grey.. use your visual side not matematic.. it helps sometimes

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