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  • IES
    IES TM-11 Technical Memorandum on Light Trespass: Research Results and Recommendations
    Edition: 2000
    / user per year

Content Description

This Technical Memorandum provides a brief description of findings and references from a 1998 research project for measuring, determining, and identifying light trespass as a component of obtrusive light. Information is included about a specific experiment conducted as part of this research project, which was intended to provide input about how individuals (test subjects) react to light trespass. Subjects provided Objectionable Ratings (ORs) for three carefully selected test conditions. The Memorandum contains two main sections: (1) Research Project describing how the research was set up and conducted (essentially the goals/questions involved, information about the test subjects, three graphs summarizing the test data, and a discussion about how the test data was analyzed); and (2) Development of Recommendations defining area classifications, describing the impact of cufew laws on the light trespass problem, making quantitative recommendations about pre- and post-curfew light trespass levels, and developing guidelines on curfews for specific environmental zones. Exceptions are noted for special situations where the recommendations cannot be met. A list of 14 references used as a basis for the research program is also included. The main body of the research may be found through the Lighting Research Office of the Electric Power Research Institute (EPRI) in Palo Alto, California. the information in this Memorandum is useful for but not specific to roadway lighting. The results of the research presented here have provided input for two other IESNA publications, RP-33, Lighting for Outdoor Environments, and TM-10, Addressing Obtrusive Light (Urban Sky Glow and Light Trespass) in Conjuctions with Roadway Lighting. Since light trespass is a complicated topic, this Memorandum only begins to address the issues and is limited in its scope. Additional research is welcomed and needed.

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About IES

The Illuminating Engineering Society of North America (IES) is the recognized technical authority on illumination. For over 100 years; its objective has been to communicate information on all aspects of good lighting practice to its members, to the lighting community, and to consumers, through a variety of programs, publications, and services.

IES is a forum for the exchange of ideas and information, and a vehicle for its members' professional development and recognition. Through technical committees, with hundreds of qualified individuals from the lighting and user communities, IES correlates research, investigations, and discussions to guide lighting professionals and lay persons via consensus-based lighting recommendations.

The Society publishes nearly 100 varied technical publications, and works cooperatively with related organizations on a variety of programs and in the production of jointly published documents and standards.

Local IES Sections and many lighting corporations offer formal educational programs on lighting, utilizing material developed by IES. Sections offer programs related to specific applications based on IES standards - seminars on sports and recreational lighting, lighting industrial facilities, roadway lighting, museum lighting, to name a few. Virtually every curriculum devoted to lighting - from beginner to advanced - includes IES educational materials.

IES is almost 8,000 members strong. Its members work with lighting in a variety of capacities - lighting designers, architects, interior designers, government & utility personnel, engineers, contractors, manufacturers, distributors, researchers and educators - throughout the United States, Canada, Mexico - and around the world. They share a common interest in lighting, and a common desire to promote the use of the latest, most innovative lighting technologies, with a focus on judicious use of energy in all lighting applications