Night Light of Dumbarton (Scotland) from space (United Kingdom) Src. Average luminocity for 10x10km area is 22.4975% and for 50x50km: 18.0063%.
Square area 10x10 km:
 2.13%
 2.88%
 2.88%
 1.75%
 3.13%
 2.01%
 3.26%
 2.51%
 3.01%
 39.47%
 36.97%Square area 50x50 km:
 5.37%
 4.38%
 1.23%
 1.54%
 1.83%
 1.45%
 1.65%
 2.04%
 3.5%
 8.06%
 68.96%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
56° 20' 9.9" North, 5° 16' 25.4" West
55° 56' 39.6" North, 4° 34' 14.2" West
55° 32' 54.9" North, 3° 52' 2.9" West
Some cities around Dumbarton sort by population:
• Clydebank
		11.3 km =7 mi, 
114°
• Vale of Leven
		3 km =1.9 mi, 
349°
• Erskine
		8.9 km =5.5 mi, 
123°
• Port Glasgow
		7.5 km =4.7 mi, 
261°
• Bonhill
		3.9 km =2.4 mi, 
6°
• Duntocher
		9.9 km =6.2 mi, 
102°
• Alexandria
		5.6 km =3.5 mi, 
349°
• Houston
		8.5 km =5.3 mi, 
172°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016