Not that I’m going for ultra realism, but dark fog colors just looks terrible. It looks more like black smoke, and that’s a pretty flattering description. Whatever color you pick is seemingly quite emissive. I think it’s a fair guess that exponential height fog was designed to be used in light scenes. Where the self glowing thingy most likely actually makes it look quite real.
I did experiment with a workaround though. I cranked up the lights in the scene to day light levels, but with a blue tint to it. I then added a post process volume to the entire scene and used a very low exposure setting for the camera instead. It looks much better with the fog. A lot. It actually solved another issue for me. Directional lights, in my case the moon, don’t respond very well to low intensity settings. There’s not much of a visible difference between, for example, 0.1 or 0.6 lux. There’s however a huge difference between 1.0 and 6.0 lux.
I’ve been struggling with fine tuning the light so the scene is barely visible. A spooky scene where you can’t tell what’s around the corners. The exposure setting in post process will let me fine tune the overall light (or dark, more so) very precisely. The fog’s self glow blends nicely into the scene’s now cranked up lighting. And then it’s all exposed down to night time in post process.