Try these links to help you learn about lights:

Poser 6 IBL Ins and outs by Olivier

A little tutorial about lighting by Olivier

Tutorial: GEL MAPS by Olivier

Here is a thread that has lots of bookmarks to tutorials and discussions on lights

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2734086

"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