ok thanks for the Camp endurance tip.
I know I add light to the place I am editing (or just edit the mission on day time and set it to night time before playing it), but I want to add some lights to the city in my mission and in the buildings. I think those are important objects to add to a mission editor to customize the map.
For now I'll just add some lights with Zeus when playing, since they can't be saved with the editor objects.