o.k., try the same scene (girl/mirror inside white box with dim point light) in your favourite non-poser GI  renderer.  note: a poser GI render of a girl/mirror inside white box with dim point light is gonna look very different from a poser diffuse IBL/AO render of a girl/mirror in an empty poser scene, in the extremely unlikely event there's any confusion between a diffuse IBL/AO render and a GI render.  there have been several attempts to explain GI and radiosity in this forum, in case that helps.