Do you know, I've been wondering about this myself. Like Dash says the probelight in P5 is supposed to be able to help in HDRI (or fake HDRI) but I don't know how to use it for such, I've managed to get V3 looking good without using ans lights at all except the problight which was interesting. I just wonder if there is a good way to fake HDRI in poser using the various node etc in the materials room ie a combination of reflection, alt diffuse, alt specular etc. perhaps in combination with a global illumination???