Here's another render. I put some blurred reflection on the ball instead of a specular effect, to show the actual light panels instead of reflections from the spot lights.

From this angle it's kind of obvious that the spot lights are only in a low position. It would be better with 10 lights, where each panel has two, high and low.

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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)