I really suggest doing these series of tutorials. IMHO Olivier is the guru of Poser Lighting.  I learned lots from him and still go and post my results from time to time to get his opinion. Sometimes I get it right, most times not, but I'm learning, hehe

A little tutorial about lighting by Olivier
Tutorial: GEL MAPS by Olivier
How Light Probes are Laid Out
Advanced Image Based Lighting in Poser 6
Basic OpenGL Lighting

This image he did with Gel Maps is amazing!

http://www.runtimedna.com/mod/forum/photos/Message187432.jpg

That is posted in the tutorial for Gel Maps thread here:

http://www.runtimedna.com/mod/forum/messages.php?ShowMessage=187407

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi