Just though I said that, I do not think it's in the list of properties but maybe it's quick to do.
Copy pasted from the volcano shader by renaming CityLights, added
CityLightsBright //instead of CityLightsTemp
In short, only SpaceEngineer will have the answer and
we will wait, unless it is planned to make mods that add functionality .
Other people tested this method and parameters to suggest/share ?