The only other one I can think of is the planet from that Enterprise episode.
We could argue that Trelane's rogue world in "Squire of Gothos" had a light source as well, sort of. But that one wasn't an orbiting spot of light, just some sort of a cheat arranged by the squire.
Quite possibly, anything and everything could be hidden inside this "Omarion nebula" thing, including a rogue planet with ersatz suns, or a giant space station, or fleet upon fleet of Jem'Hadar ships. That the Founders decided to use a rogue planet might tell us... Nothing at all, I guess.