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LRC News

Summer 2008
Field Study Verifies Unified System of Photometry Conserves Street Lighting Energy

Lighting evaluation in Groton, CTThe LRC completed a field study to evaluate whether a proposed alternative to conventional photometry can conserve energy from street lighting while maintaining or improving perceptions of visibility, safety, and security. The LRC’s proposed unified system of photometry was designed to characterize any light level, including mesopic light levels (commonly found outdoors at night) where the photopic and scoptopic luminous efficiency functions may misestimate the effectiveness of some light sources used in nighttime applications. The field study, which was demonstrated and evaluated in the City of Groton, Conn., with funding from Groton Utilities, verified that a unified system of photometry can conserve street lighting energy in rural and suburban areas.

The full report detailing energy use, consumer acceptance and perceptions, visibility, and light levels is available online at

About the Lighting Research Center

The Lighting Research Center (LRC) is part of Rensselaer Polytechnic Institute of Troy, N.Y., and is the leading university-based research center devoted to lighting. The LRC offers the world's premier graduate education in lighting, including one- and two-year master's programs and a Ph.D. program. Since 1988 the LRC has built an international reputation as a reliable source for objective information about lighting technologies, applications, and products. The LRC also provides training programs for government agencies, utilities, contractors, lighting designers, and other lighting professionals. Visit

Contact:lrcnewsletter@rpi.eduPhotos & Graphics:Dennis Guyon
Editor:Mary CimoWeb Production:Joann Coffey
Contributing Writers:Jennifer Taylor, Mary Cimo
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