Might add, the default light set isn't always good to use in a final rendering BUT the three lights used DO light things in a way that makes it easy to pose your figures.  Different light sets for different portions of your project.  I often save the 'final' light sets to my library and then load a special pose light set just to position and pose the figures.  With a click from the library I can go back and forth until I've everything set.  Then I load and tweak my 'final' light set until I find a final 'final' light set.

I think the default lights are especially good for working in the pose studio.  Some sets I have contain a fourth light set up to shine from the back of the studio so I can see the back of my figures well.  Thinking about writing a light tutorial myself ...

Best Wishes,
Rªnce