I think that's enough for now.

You have enough knowledge now, that you should be able to make some important predictions about what will happen when you move the light around.

You should also be able to predict what happens if you add another light to the scene, or change the intensities of these lights.

Remember always, that you cannot see numbers bigger than 1, but they are there. If you put too many lights together at high enough intensities, you'll be trying to render numbers bigger than 1.

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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)