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Home We are the Portland Maine based section of the Illuminating Engineering Society a notforprofit organization dedicated to all aspects of the ART and SCIENCE of ILLUMINATION. The IES is the recognized technical authority on illumination. For over a century 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. The strength of the IES is its diversified membership consisting of engineers architects designers educators students contractors distributors utility personnel manufacturers and scientists all contributing to the mission of the society to advance knowledge and disseminate information of the improvement of the lighted environment to the benefit of society.