Many facets of light pollution

Abstract

The article "Lighting and Askonomy" bv Chris Lueinbuhl. Connie Walker, &d~ichard~ainsco(aPtH YSICSTODAY, December 2009.. n.ae-e 32) is a welcome , and important discussion of the impact of uutdoor lighting on astronomical observation. It seems to fall short, how ever, with regard to actual practice and the effects outdoor lighting has on communities other than astronomers. Light pollution is wasted light and should be minimized for both environmental and financial reasons. Despite good intentions, many outdoor lighting applications waste light. The following important questions are not addressed in the article: How much light are we wasting now? How do we measure wasted light? And what can be done to reduce that waste?