Allthough not tradition Lights, Poser can add Glow and then Gain, to any Geometry.  Glow would make an object Visible, and Gain would cause it to emmitt light.  But objects that receive only Gain'd Light, are'nt usually very attractively detailed?
Huh? You can make a shader draw any colors regardless of lighting by plugging things into he ambient, alternate_diffuse, or alternate_specular, reflection_color, refraction_color, etc. inputs on the root node. This can simulate the appearance of the object glowing. But no objects actually "glow" in the sense that light is emitted into the environment and appears in the diffuse or specular calculations of other objects.

There is a "Gather" node that is basically a super-blurred reflection but it is not at all the same as the Global Illumination features you have in other renderers such as Modo. Modo can make any prop truly emit light. It is possible to make a scene with absolutely no "lights" whatsoever in Modo.

In Poser I can make any object show any color I want, and theoretically I can write enough math into every shader that it seems to be reacting to some prop that glows. But that's not built into Poser at all.

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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)