Night Light of Secret Harbour (Western Australia) from space (Australia) Src. Average luminocity for 10x10km area is 29.4359% and for 50x50km: 12.738%.
Square area 10x10 km:
 1.1%
 1.83%
 1.83%
 2.01%
 9.16%
 9.89%
 3.48%
 5.31%
 10.62%
 37.91%
 16.85%Square area 50x50 km:
 1.24%
 1.21%
 0.8%
 1.03%
 3.98%
 3.13%
 1.93%
 2.51%
 3.06%
 9.46%
 71.65%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
31° 48' 37.2" South, 115° 3' 19.4" East
32° 24' 21.2" South, 115° 45' 30.7" East
32° 59' 51.2" South, 116° 27' 41.9" East
Some cities around Secret Harbour sort by population:
• Baldivis
		10.9 km =6.8 mi, 
38°
• Port Kennedy
		3.7 km =2.3 mi, 
349°
• Waikiki
		10 km =6.2 mi, 
357°
• Warnbro
		7.4 km =4.6 mi, 
351°
• Greenfields
		13.2 km =8.2 mi, 
178°
• Meadow Springs
		10.2 km =6.3 mi, 
182°
• Safety Bay
		11.4 km =7.1 mi, 
352°
• Cooloongup
		10.3 km =6.4 mi, 
10°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016