Night Light of Houston (Scotland) from space (United Kingdom) Src. Average luminocity for 10x10km area is 26.4724% and for 50x50km: 19.9337%.
Square area 10x10 km:
 3.76%
 4.76%
 1.75%
 1.63%
 2.51%
 4.51%
 4.26%
 7.02%
 12.28%
 18.17%
 39.35%Square area 50x50 km:
 5.72%
 4.85%
 1.39%
 1.7%
 1.99%
 1.61%
 1.88%
 2.17%
 3.67%
 9.66%
 65.36%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
56° 15' 40" North, 5° 15' 18.5" West
55° 52' 6.9" North, 4° 33' 7.2" West
55° 28' 19.4" North, 3° 50' 56" West
Some cities around Houston sort by population:
• Paisley
		8.5 km =5.3 mi, 
118°
• Clydebank
		9.8 km =6.1 mi, 
68°
• Renfrew
		10 km =6.2 mi, 
87°
• Dumbarton
		8.5 km =5.3 mi, 
352°
• Johnstone
		4.9 km =3 mi, 
152°
• Erskine
		7.3 km =4.5 mi, 
60°
• Linwood
		4.3 km =2.7 mi, 
121°
• Elderslie
		5.7 km =3.5 mi, 
133°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016