What version of Poser are you using? That makes a difference when it comes to recommending light sets.

The way Poser treats lights in Poser 6 and 7 is vastly different than in earlier versions. In Poser 5 and earlier versions you needed about 20 lights to get a good lighting effect.  With Poser 6 and 7 you can use as few as 2.   I find for me that I need to have at least 3 or 4 lights in my scene, but others who are more proficient have shown that they can use 1 light.

Less lights means faster render times because Poser doesn't have to render all of those shadow maps for each light.

That being said, you can still use lights from Poser 5 in Poser 6 and 7, but versions 5 and 6  will only preview 8 lights so the scene will look dark, but the lights will still render fine.

If you have Poser 6 or 7, I suggest you have a look at these threads. 

Olivier's Making of a pomo pic
Castle Poser Tutorials
Poser 6 IBL Ins and outs by Olivier
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

If you are using Poser 5, I highly recommend the "Complex Global Lighting 2" available at Daz.. I use Poser 6 and sometimes I will still use my favourite light set from that package even though it extends my render time.

There are also lots of free lights at RDNA in the free area. Just go there and search "Light".  Many of them work very well with Poser 6 and 7.

"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