Night Light of Trollhättan (Västra Götaland) from space (Sweden) Src. Average luminocity for 10x10km area is 41.2347% and for 50x50km: 6.0477%.
Square area 10x10 km:
 12.93%
 13.49%
 3.06%
 1.36%
 0.68%
 1.25%
 2.15%
 3.4%
 15.53%
 25.62%
 20.52%Square area 50x50 km:
 1.36%
 1.43%
 0.37%
 0.44%
 0.43%
 0.37%
 0.38%
 0.59%
 2.04%
 4.8%
 87.8%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
58° 39' 4.9" North, 11° 35' 7.9" East
58° 17' 1.1" North, 12° 17' 19.1" East
57° 54' 43.5" North, 12° 59' 30.4" East
Some cities around Trollhättan sort by population:
• Uddevalla
		21.4 km =13.3 mi, 
289°
• Alingsås
		41.8 km =26 mi, 
159°
• Kungälv
		49.3 km =30.6 mi, 
201°
• Vänersborg
		11 km =6.8 mi, 
10°
• Stenungsund
		36.4 km =22.6 mi, 
229°
• Lysekil
		49.9 km =31 mi, 
268°
• Gråbo
		49.8 km =30.9 mi, 
179°
• Vårgårda
		41 km =25.5 mi, 
131°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016