With the newer lighting systems in both regular and Pro series Poser, older sets are becoming completely obsolete.  IBL is being replaced by IDL, multiple lights are dwindling down to absolute minimums for more realistic results, and lower intensities  oupled with light emitting objects are becoming more the standard.  An excellent way to learn lighting, observe your surroundings and imitate lighting as found in natural and manmade environments.  Too often, artists ignore the very basics of light placement and intensities.  That's why many gallery images have lighting coming from below in outdoor settings which is both unrealistic and unflattering.