I usually use Baggin's Bills environment sphere and put an HDRI from HRDI Haven on it to light the scene. I don't know which version of Poser do you use, but in most cases that works better for me that using some (IMHO outdated) IBL light.

If you use Poser 11 and Superfly, IBLs won't work correctly anyway in most cases. And even FireFly's indirect lighting work with the env sphere.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.