I have to think you've got the coordinates wrong. Try disconnecting the node from the point light intensity and just render with it normal, no falloff. Do you get shadow under the table?

For speed testing purposes, I'd hide the figures and just deal with the walls, floor, ceiling, and table.

I'd also change Pixel Samples=1, Min Shading Rate = 3, and render only about 200 pixels wide. That's all good enough to see how much light falls everywhere. Should be 50 times faster.

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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)