Another pseudo-legal term is “light trespass.”
Presumably some time ago an observatory in {Tucson?} Arizona had problems with mercury-vapor light interfering with their work, and was fixed by replacement of area lighting with high-pressure sodium fixtures in outdoor areas. Ehh, there’s
http://www.rasc.ca/light/print/ida-let.htm “Lost Heritage”
http://www.nmt.edu/mainpage/news/2001/23mar02.html “Night Sky Protection Act”
www.darksky.org/papers/rasc_art.html “mercury vapor lighting"
http://cfa-www.harvard.edu/cfa/ps/nelpag/CIRC012.html “New England Light Pollution Advisory Group”
