OK Back to white, 100% on both light and prop.

Move the light yRotate to 45 degrees.

Render.

The intensities have swapped. #4 is the brightest now, because it faces the light. #1 is the darkest, because it is 45 degrees out of alignment.

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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)