dphoadley -

When using ray-tracing and the whole other ambient IBLs and what-not settings for Firefly, there seesm to be a need for a lot of fiddling around with the parameter settings for each light. 

But I am speaking from a Poser 6 perspective, so I don't know if in Poser 5, the light settings play as big a role in determining final render effectiveness.
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Eternal Hobbyist