Institution of Lighting Professionals
The Institution of Lighting Professionals (ILP) is a United Kingdom and Ireland professional engineering institution founded in 1924 as the Association of Public Lighting Engineers, later known as the Institution of Lighting Engineers, and taking its present name in 2010. It is licensed by the Engineering Council to assess candidates for inclusion on its Register of professional Engineers.
Source: Wikipedia — Institution of Lighting Professionals (CC BY-SA 4.0)