I moved the left-side spotlight to the center. I did *not* change intensities. Yet, I've increased the illumination. This is because illumination depends on angle of incidence.

By bringing these two lights closer together, I've changed the total illumination they produce in the overlapping area. I'm not pushing just a little too much - I can tell because the specular ring is red, and the diffuse center is yellow. I should decrease one (or both) of the light intensities for best results.

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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)