On that shader, the Clouds are used to make the tiled pattern irregular, distorting it just enough to hide the fact that it's just a 256-pixel square repeated over and over.

The Math_Functions_5 value is adjusting the ratio of those caustics to the overall light level. At .97 there's a nice balance focused vs. unfocused light. Increase closer to 1 to have less unfocused light. Lower it to have more light. Adjust your light intensity as you see fit for the circumstances. Remember, we don't have an exposure control for cameras in Poser (why? makes no sense) so instead we have to put knobs on our lights and set them to crazy things like 1600%.

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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)