No you will get not wrong your light after you change the UV scale of both map and the light probe  that is correct, one only thing wrong would be that the scene would not match the standard direction in poser scene that is all about...  I just wanna keep the direction as it was design for in poser and other software based on the earth directions and that is very important for me.. you got confused by the mirror image and that why you have issues with that.. what's again is not a flipped image
horizontal..

if you look yourself in the mirror you see flipped image of your face ?, are the window reflected in the mirror still on the same side or it flip to other side ? do you know function of a mirror ? I guess not other you will understand what I said and my dear you lost the battle here..

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