And yes, you can use props as light sources. But if they are really small and super bright, you get artifacts. Poser IDL is an approximation, one in which the detail of tiny pinpoints of light are not effective. It's meant for general bounced light, not so much for physical props as light bulbs. Its goal is speed, not full-on global illumination.

I use these big disks as light sources or as diffusers of bounced light. Sort of like studio umbrellas that photographers use.

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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)