Night Light of Koltushi (Leningradskaya Oblast') from space (Russia) Src. Average luminocity for 10x10km area is 45.9913% and for 50x50km: 42.7975%.
Square area 10x10 km:
 10.71%
 12.55%
 3.79%
 5.52%
 1.95%
 0.87%
 6.82%
 11.36%
 15.58%
 16.67%
 14.18%Square area 50x50 km:
 22.27%
 8.78%
 3.15%
 3.03%
 2.22%
 1.55%
 1.78%
 3.33%
 4.75%
 7.11%
 42.03%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
60° 16' 48.5" North, 29° 56' 29.5" East
59° 55' 46.9" North, 30° 38' 40.7" East
59° 34' 31.8" North, 31° 20' 52" East
Some cities around Koltushi sort by population:
• Krasnogvargeisky
		10.6 km =6.6 mi, 
297°
• Centralniy
		15.8 km =9.8 mi, 
270°
• Rybatskoye
		12.9 km =8 mi, 
219°
• Vsevolozhsk
		9.6 km =6 mi, 
9°
• Obukhovo
		14.4 km =8.9 mi, 
228°
• Metallostroy
		15.3 km =9.5 mi, 
200°
• Imeni Sverdlova
		14.9 km =9.3 mi, 
175°
• Romanovka
		13.3 km =8.3 mi, 
16°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016