The appropriate placement and selection of light sources for outdoor lighting installations is rapidly becoming a very important issue when considering the need to mitigate the effects of the obtrusive lighting. The appropriate control of outdoor lighting equipment is one of the main concerns of ordinances being produced by municipalities all over the world. Lighting consultants must be prepared to present a lighting master plan capable of meeting strict lighting ordinances with recommended practices to be followed by cities and communities to achieve the goal of quality yet confined lighting. This paper discusses the merits of using the pseudocolor analysis feature provided by some lighting software programs to assess the effects of obtrusive light in terms of light trespass, glare, and sky glow produced by common outdoor lighting installations and to verify the compliance of the lighting parameters of these installations with the CIE requirements. Some practical examples developed with the AGi32 lighting software are given showing the influence of fixture positioning, photometric distribution and lamp wattage in the results. These examples also demonstrate the efficacy of this analysis process as a useful tool to assist the lighting professionals in refining their outdoor lighting design.
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