Illuminating Engineering Society

The Illuminating Engineering Society (IES) is a United States-based, industry-backed not-for-profit learned society focused on the science, engineering, design, and practical application of light. Founded in New York City on January 10, 1906, the organization brings together lighting engineers, designers, architects, researchers, manufacturers, educators, electrical professionals, and other specialists concerned with the quality and performance of illuminated environments. Its stated public purpose is to improve the lighted environment by connecting people with lighting knowledge and translating that knowledge into practical action. IES is best known as a professional knowledge and standards organization rather than as a commercial lighting manufacturer. It develops and disseminates technical guidance, recommended practices, educational material, publications, and professional programming covering subjects such as interior and exterior illumination, lighting controls, daylighting, energy performance, visual comfort, sports facilities, offices, healthcare environments, roads, public spaces, and other specialized applications. The Society is accredited by the American National Standards Institute as a standards developer, and many of its documents are used by practitioners, regulators, educators, and related technical organizations. Its work is also referenced by institutions such as the National Institute of Standards and Technology and by organizations concerned with outdoor lighting and dark-sky policy. The organization has operated under the IES identity since its legal incorporation. A later edition of its Lighting Handbook popularized the expanded name Illuminating Engineering Society of North America, commonly abbreviated IESNA. That label remained in professional use for several decades, but the Society returned to the shorter IES designation when the tenth edition of the Lighting Handbook was published in 2010. The North American orientation remains important, even though IES publications, awards, technical ideas, and local activities have international reach. IES is organized through approximately one hundred local sections and other professional networks. These sections support meetings, lectures, local education, design recognition, technical exchange, and community building. The Society's annual Illumination Awards program, established in 1973, recognizes notable work by lighting engineers and designers. Its award areas include interior lighting design, outdoor lighting design, energy and environmental design, lighting-control innovation, and residential lighting design. Recognized projects have included cultural institutions, transportation facilities, civic spaces, educational buildings, healthcare settings, commercial developments, memorials, and public landscapes. Publishing has been central to IES since its earliest years. The Society issued Transactions of the Illuminating Engineering Society from 1906 through 1939, followed by the monthly publication Illuminating Engineering. In 1971, that publishing activity developed into Lighting Design & Application and the Journal of the Illuminating Engineering Society. The magazine later became LD+A, while the scholarly journal was renamed LEUKOS in 2004. LEUKOS is published by Taylor & Francis, and LD+A is published through Sage Journals and made available to members. Together with the Lighting Handbook and more than one hundred other technical publications, these resources form a major reference base for the lighting profession. Today, IES remains an active professional society headquartered in New York City. Its relevance has expanded beyond traditional lamp and luminaire engineering to include solid-state lighting, digital controls, adaptive systems, human experience, energy conservation, environmental responsibility, daylight integration, and the relationship between lighting and the built environment. Its principal value lies in convening expertise, maintai…

The Illuminating Engineering Society was founded in New York City on January 10, 1906, during a period when electric lighting was becoming an increasingly important part of industrial development, architecture, transportation, and public life. From the beginning, the Society served as a forum for people working with the measurement, design, engineering, and application of light. It was legally incorporated in 1906 and became known simply as IES, a name it has retained throughout its existence. The Society developed as a learned and professional organization rather than as a producer of lighting equipment. Its activities centered on technical exchange, education, publications, and the establishment of shared practices. It published Transactions of the Illuminating Engineering Society from 1906 to 1939. In 1940, that publication was replaced by the monthly periodical Illuminating Engineering, reflecting the Society's continuing effort to distribute practical and technical knowledge to the profession. In 1971, the publication program evolved into two distinct channels: Lighting Design & Application, intended primarily for professional and applied communication, and the Journal of the Illuminating Engineering Society, focused more heavily on scholarly and technical material. The magazine later became LD+A, while the journal was renamed LEUKOS in 2004. LEUKOS is published by Taylor & Francis, and LD+A is distributed through Sage Journals and offered as a member benefit. The Society has produced more than one hundred publications, including its influential Lighting Handbook and application-specific guidance for offices, sports facilities, outdoor environments, healthcare facilities, and other settings. The term Illuminating Engineering Society of North America gained visibility through the sixth edition of the Lighting Handbook in 1981. The IESNA designation was used for many years and reflected the Society's principal institutional base in North America, although the Society's ideas and activities reached a broader international audience. In 2010, the tenth edition of the Lighting Handbook removed the expanded designation and returned the organization to the shorter IES name. IES became an ANSI-accredited standards developer. Through this role, it has contributed to consensus-based technical documents, recommended practices, and standards used in lighting design, engineering, product evaluation, energy performance, controls, and application planning. Its publications are referenced by technical bodies and public-interest organizations, including NIST in relation to optical-radiation calibration and the International Dark-Sky Association in discussions of outdoor-lighting policy. The Society also built a distributed professional structure. Approximately one hundred local sections provide meetings, lectures, educational programs, networking, and regional engagement. This section-based model allows IES to connect national technical work with local building practices, professional development, and design communities. Recognition of design quality became another important part of the Society's history. The Illumination Awards program began in 1973 and has since honored engineers and designers for original, technically strong, and aesthetically successful projects. Award categories have covered interior lighting, outdoor lighting, energy and environmental design, lighting controls, and residential lighting. The program has recognized projects across North America and internationally, including cultural buildings, campuses, airports, memorials, public parks, healthcare facilities, commercial spaces, and adaptive-reuse projects. In the contemporary lighting sector, IES operates at the intersection of engineering, architecture, design, research, energy policy, and professional education. Its remit has expanded with the emergence of LEDs, digital controls, tunable systems, daylight-responsive design, adaptive outdoor lighting, and growing concern about energy use and environmental impact. The Society remains headquartered in New York City and continues to function as a not-for-profit knowledge, standards, publishing, and professional-recognition institution.

1. 2010Society returns to IES name

   The tenth edition of the Lighting Handbook removed the IESNA designation and restored the shorter IES identity.

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2. 2004Journal renamed LEUKOS

   The Journal of the Illuminating Engineering Society was renamed LEUKOS.

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3. 1981IESNA designation gains prominence

   The sixth edition of the Lighting Handbook used the expanded name Illuminating Engineering Society of North America.

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4. 1973Illumination Awards established

   IES began its annual Illumination Awards program to recognize meritorious original lighting design and engineering.

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5. 1971Publication program divides into magazine and journal

   The Society launched Lighting Design & Application and the Journal of the Illuminating Engineering Society as successor publications.

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6. 1940Illuminating Engineering replaces Transactions

   The Society replaced its earlier transactions publication with the monthly periodical Illuminating Engineering.

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7. 1906Society founded in New York City

   The Illuminating Engineering Society was founded on January 10, 1906, and legally incorporated in New York.

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8. 1906Transactions publication begins

   IES began publishing Transactions of the Illuminating Engineering Society as a vehicle for technical and professional knowledge.

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Professional society, technical publisher, education provider, and ANSI-accredited standards developer for the lighting engineering and design sector.

• IES Lighting HandbookTechnical handbook

  The Lighting Handbook is the Society's principal broad reference work for lighting science, engineering, design, measurement, and application. Its editions consolidate technical knowledge relevant to professionals working across indoor and outdoor environments. The handbook has also served as an important marker of the Society's institutional identity, including the 1981 appearance of the IESNA designation and the 2010 return to the shorter IES name.

• LEUKOSScholarly journal2004

  LEUKOS is the scholarly journal that followed the Journal of the Illuminating Engineering Society. Published by Taylor & Francis, it provides a research-oriented channel for lighting science, engineering, human factors, technology, and related built-environment topics. The journal is issued four times per year.

• LD+AProfessional magazine1982

  LD+A is the Society's professional magazine and successor to Lighting Design & Application. Published through Sage Journals, it communicates applied lighting knowledge, professional developments, design practice, and sector news. The publication is available as a member benefit and complements the more research-oriented LEUKOS journal.

• ANSI lighting standards and recommended practicesStandards and technical guidance

  IES develops consensus-oriented standards and recommended practices as an ANSI-accredited standards developer. Its documents address lighting applications and performance questions across areas such as offices, sports, outdoor environments, healthcare facilities, controls, daylighting, and energy-conscious design. These materials help professionals coordinate design decisions, technical evaluation, and public or regulatory requirements.

• Illumination AwardsProfessional awards1973

  The Illumination Awards recognize individual engineers and lighting designers for original and meritorious built work. International award categories include interior lighting design, outdoor lighting design, energy and environmental design, lighting-control innovation, and residential lighting design. Winning and specially cited projects have ranged from museums and campuses to parks, airports, memorials, healthcare facilities, and commercial interiors.

• 1973IES Illumination Awards

  United States · North America · International

  An annual professional-recognition program highlighting technically accomplished and aesthetically effective lighting projects. Categories have included interior and outdoor lighting, energy and environmental design, controls, and residential lighting.

  Outcome. The program became a long-running platform for recognizing lighting engineers and designers and has included projects from numerous countries.

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• 2010Return to the IES identityStrategy

  The expanded IESNA label had persisted for decades, even though the Society had historically been known as IES.

  What changed. The tenth edition of the Lighting Handbook removed the IESNA moniker and returned the organization to the shorter IES name.

  Aftermath. The change reaffirmed the Society's established identity while preserving its North American institutional base and international professional reach.

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• 1981Adoption of the IESNA designationStrategy

  The sixth edition of the Lighting Handbook presented the expanded name Illuminating Engineering Society of North America, which subsequently became widely used in the profession.

  What changed. The Society permitted the IESNA designation to become an established public and professional identifier while retaining IES as its longstanding abbreviation.

  Aftermath. IESNA remained in use until the Society later returned to the shorter IES identity.

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• 2022IES Illumination Awards recognize international lighting projects

  The Society's awards program recognized interior and exterior lighting projects from multiple countries, including work in Japan, Ukraine, China, and the United States.

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• 2010IES returns to the shorter IES identity

  The tenth edition of the Lighting Handbook removed the IESNA moniker, reinforcing the Society's longstanding IES identity.

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• 2004LEUKOS continues as the Society's scholarly journal

  The Journal of the Illuminating Engineering Society was renamed LEUKOS, which is published by Taylor & Francis with four issues per year.

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• 1981IES adopts the IESNA designation in its Lighting Handbook

  The sixth edition of the Lighting Handbook helped establish Illuminating Engineering Society of North America, or IESNA, as an expanded designation for the Society.

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1. Illuminating Engineering Society
2. Illuminating Engineering Society official website