I see almost no difference betweeb the 2. Might be because there are no reflections visible. If you would need to highlight the sun only that would be noticable. By the way, I saw that Poser 4 CAN render reflections! I rendered a big white ball and it reflected the environment correctly! Only vagually but noticabel! An other thing I noticed was that my renders only have 1 shadow and not a lot of weak ones like most global illumination lightsets have. That is probably because the sun overrules all other shadows. Anyway, it looks good and I never thought Poser 4 could do something like this!