Well, all I can say is that the examples you provided such as Arena doesn't have a light source, something like Darker implies as the name suggests and lastly Attack&Defense has light sources but is just too high up to be visible at the bottom. Based on the examples you provided I would say though if you would want to see improved lightings in these maps they will need some sort of redesign as well. Knowing that you are very technical Bunny, it would be good if you can make a list of maps that already have light sources but could use an improvement in volumetric / improved lighting, so we have a starting point.
