caravaggio, I use between 20 and 30 lights for my simulated HDRI in poser. I dont really think its neccassary to use as may as 60-100. The majority of my lights have been created for waist up shots but they work the same with any scene. The lights i make are similar to travelers in the fact that each setup is custumised for a specific backgroud. travelers lights have about 20 lights i think (i cant remember the exact amount). Also ive found that you can get convincing HDRI effects with anything over 15 lights. Hope this helps.