Quote - And here's something I discovered accidentally when leaving value2 of the power node black.

I used a single white diffuse light on this one.

This is no mystery. If you'll recall from math, any non-zero number raised to the zero power is 1. That is

x ^^ 0 == 1 for all x != 0

Now if Value_2 is black, that is numerically 0. Voila - all white no matter the incoming color value.

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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)