What version of Poser and what types of scenes?  If you are using Poser 8 or higher, I wouldn't buy lightsets, but search up lighting threads here.  Most commercial lightsets are set up to overcome the limitations of earlier versions of Poser.

Here are some general lighting tutorials...

http://seedydeedee.deviantart.com/gallery/3385007

Here's a webinar video on lighting from Smith Micro...

http://www.youtube.com/watch?v=o0AasrYg31E

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