just to say....

it's probably due to what i consider a bug in Poser.  there's a reason there's a "delete lights" script. i pretty much always do my own lights, so i haven't checked the situation variables involved, but when you apply a new light set, the old lights usually get turned off instead of replaced.  some people seem to have written their light setting properly and it does replace them, but a lot of lights (especially in PPP times)  just overlaid your present lights.  do that a few times, even with your own light sets, and what you've got is a huge number of lights that aren't doing anything.  add in the past use of 10+ lights to imitate global lighting, and you've got a light set that's kind of hard to manage.  iirc, there was a script in free stuff to clean up your lights.  or maybe more than one.  i can remember the thumbnail for it.  it gets rid of lights that are off.  it might still be there.