How is the relative contrast of dark and light constrained in Poser? I mean the question literally because I don't understand what you're addressing.

Let me be more specific - the intensity dial can be .001% or 1000%, for any given light.

The math nodes can be used with images allowing you to increase or decrease the amplitude of any prop-based lighting object by any factor you want, up to at least 1,000,000,000,000,000,000 ... keep adding zeros until there are 37 of them.

I say "at least" this many zeros because that is the dynamic range of single-precision (32-bit) floating point numbers. I actually believe Poser uses bigger floating point (64-bit or 80-bit) numbers, which would make the dynamic range even more huge. But I don't have time to go prove that at the moment, so I'm going with the "smaller" number 10^38.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)