Hi I've got a similar problem in one of my maps.. Although here it's related to ammo_spore models.
As you can see the room is properly lid. Shining in a green light including some lamps shining white.
My models are black though. Sometimes I noticed that at least 1 or them shines properly but just sometimes after a compile.
I'm compiling with -minlight 10 I even set lights in front of the models. I redid the whole room in a new brush in the hope to get it working.
I set a color source inside the models itself (not sure if that's actually supported) yet they are still pitch black. I've also played around with the rendering settings giving each spore a different setting just for testing. Some solid 255 - some solid 1 - some color etc..
Yet they refuse to illuminate. My map has 0 leaks and as I said I just redid the whole room and it's still not working.
Any ideas?
EDIT: Managed to solve it. Turns out I had dozen of micro leaks in most of my maps but these first showed up after switching the Map Editor to a newer version and then fixing the micro leaks - suddenly it worked.