Yeah, Poseray is merely the conversion tool and Povray
http://www.povray.org/
is the actual renderer. I've been using the combination a bit more than a year and really like it a lot. Light behaves the way it's supposed to in Pov-ray, especially "in the box" (a six sided, 4 walls-ceiling-floor, architectural set.) Any questions, feel free to ask.
There are also pov-ray extension apps that allow the use of renderman shaders, which are great, and macros like lightsys, which do a great job quickly and easily matching light types-sunlight, flourescent etc.
There are plenty of sample files available on the net and with the command line aspect it's pretty easy to cut and paste lights from one file to another.

Message edited on: 01/03/2006 16:31

Message edited on: 01/03/2006 16:32