Night Light of Pontarddulais (Wales) from space (United Kingdom) Src. Average luminocity for 10x10km area is 12.5% and for 50x50km: 7.673%.
Square area 10x10 km:
 0%
 0.56%
 0.98%
 0.7%
 2.52%
 1.4%
 2.52%
 2.66%
 5.46%
 21.43%
 61.76%Square area 50x50 km:
 0.94%
 1.2%
 0.63%
 0.94%
 1.04%
 0.99%
 0.99%
 1.14%
 2.9%
 6.65%
 82.59%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
52° 8' 52" North, 4° 44' 30.2" West
51° 42' 51.2" North, 4° 2' 18.9" West
51° 16' 35.3" North, 3° 20' 7.7" West
Some cities around Pontarddulais sort by population:
• Swansea
		12.3 km =7.6 mi, 
147°
• Llanelli
		9.2 km =5.7 mi, 
247°
• Neath
		17.1 km =10.6 mi, 
109°
• Ammanford
		9.4 km =5.8 mi, 
21°
• Gorseinon
		5 km =3.1 mi, 
182°
• Clydach
		10.2 km =6.3 mi, 
109°
• Burry Port
		14.7 km =9.1 mi, 
256°
• Brynamman
		15.2 km =9.4 mi, 
51°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016