http://www.lightpollution.it/worldatlas/pages/fig1.htm has all the light pollution maps, covering the whole world (hard to overlay) or for regions (like australia). I think I overlayed the oceania map which is a small download of 1.2Mb that extracts into a 280Mb TIFF.
Here is a better capture showing night sky brightness with several popular AEST observing sites included: