Night Light of Langen (Hesse) from space (Germany) Src. Average luminocity for 10x10km area is 31.8725% and for 50x50km: 29.7219%.
Square area 10x10 km:
 2.8%
 3.78%
 6.86%
 1.96%
 2.38%
 2.66%
 5.18%
 2.8%
 21.99%
 42.02%
 7.56%Square area 50x50 km:
 6.02%
 5.91%
 2.48%
 2.86%
 3.67%
 2.95%
 3.98%
 5.04%
 10.78%
 18.17%
 38.15%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
50° 26' 22.2" North, 7° 57' 55.4" East
49° 59' 22.4" North, 8° 40' 6.7" East
49° 32' 7.3" North, 9° 22' 17.9" East
Some cities around Langen sort by population:
• Dreieich
		3.9 km =2.4 mi, 
30°
• Neu Isenburg
		6.8 km =4.2 mi, 
15°
• Dietzenbach
		8.1 km =5 mi, 
73°
• Mörfelden-Walldorf
		6.1 km =3.8 mi, 
275°
• Weiterstadt
		11.1 km =6.9 mi, 
210°
• Niederrad
		10.8 km =6.7 mi, 
344°
• Egelsbach
		2.4 km =1.5 mi, 
188°
• Erzhausen
		4.1 km =2.5 mi, 
201°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016