bantha, that is correct. If you render to an HDRI, then you have floating point numbers for each pixel. Tiny numbers as well as numbers well over 1 can be represented with excellent fidelity, and can then be adjusted to an integer in the range 0 to 255 via manipulation of "exposure" controls.

We only have this problem if we're saving as an LDRI - in which case the smallest delta we can represent is 1/255 and the highest value is 1.0.

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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)