Seems to be a Poser 5 issue. I experienced this myself with those same lights. I was using Darkworld's V3 textures, oblivion I think the name was. The texture has a reflection map on it, and once rendered, the whole body was nearly white. Rendering in P4, however, turned out the way it should have. I spent a few hours of tweaking and rendering, but couldn't find a good solution. And this isn't the only lightset to do this. Try Shademaster's "Poser Render Upgrade" in freestuff. It does the same thing. So no, it's not a DAZ issue. It's a P5 issue. Just wish there was a solution...