That's a great question. Maybe one of the PZ2 file hackers around here knows how to do that. I'm pretty sure that isn't possible by simply saving the two items - I don't think Poser will let you even choose a light when saving to the props library. But, like so many other things, I bet if you correctly combine the contents of a light file and a prop file, it can be done.

Perhaps you could open up that prop you got in a text editor and poke around to see how it was done.

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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)