IESNA

The Illuminating Engineering Society of North America (IESNA) is a professional organization dedicated to the science and practice of lighting and illumination engineering in North America. Historically, IESNA was the North American branch of the Illuminating Engineering Society; today the global body is commonly referred to as the Illuminating Engineering Society (IES), with IESNA appearing in historical contexts. The organization brings together lighting designers, engineers, researchers, manufacturers, educators, and policymakers.

IESNA develops and publishes standards, guidance, and reference materials used by professionals in the design, specification, and assessment of lighting. Its publications include the IES Lighting Handbook and a range of recommended practices and measurement standards. The society also provides educational resources, professional development opportunities, technical seminars, and conferences aimed at advancing lighting knowledge, energy efficiency, safety, and visual comfort. It operates through a network of local sections and members across the United States and Canada.

Involvement with other standards bodies is typical; IESNA materials are used to support compliance with national and international standards and codes related to lighting performance and safety. The organization has played a historical role in advancing photometric measurement methods, lighting quality criteria, and energy-efficient design.