For more than a century, the IES has been the recognized technical authority on lighting, committed to advancing knowledge and promoting excellence in the design, application, and benefits of quality lighting. Our strength lies in our diverse membership — engineers, architects, designers, educators, students, contractors, distributors, utility professionals, manufacturers, and scientists — all united by a shared mission:

To improve the lighted environment for the benefit of society.

The IES serves as a forum for collaboration and professional growth, connecting lighting professionals through research, education, and shared expertise. Through its many committees, the Society develops consensus-based guidelines and recommendations that inform and inspire lighting practices worldwide.