The fact that the intensity of light decreases with distance is consistent with reality, that's why Poser's spots and point lights have this setting. Area light don't have it as they mimic this. Inifinite light "seems" to keep its intensity, as even the Earth'd diameter is nothing compared to the distance Sun-Earth.
The hborre's mat setting is the one that is the best.

That being said, it's relatively easy to use: setup the node as shown above, select the middle ones, right clic-> collapse to compound node:

Afterward, your setup will look like this

And from a scene like this:

You'll get this:

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