Thank you all for your help.

Believable3D, I changed intensity and still got white scene. BTW, I used only one IBL light.
ghonma, thanks for the links.
Latexluv, this link is great and I will use it, but take in mind it generates jpg, not hdr file.
ice-boy, I see now that the tutorial I took was indeed Poser Pro tutorial: poserpro.net/King_Tut/Lighting/poser_IBL.html
If Poser 7 can handle hdr files correctly, can you explain how?

Thanks again...