I agree completely with Laurie.  Many lights sets currently available, either as freebies or for sale, are based under the old technology programmed into earlier versions of Poser.  That was a time when gamma correction was least understood in the 3D world and light sets were created to overcome those particular situations.  With the release of P8 and PP2010, those same light sets have become completely useless and out of date.  I am one of those that have given up using light sets and generate my own. 

Resort to raytracing rather than depth shadow, you will retain reflections and eliminate nostril glowing.  Learn to use IDL, Indirect Diffuse Lighting, in P8.  It simulates global illumination better than IBL, Image Based Lighting.