Consultancy for the measurement of material circularity for the realization of a lighting system with over 4,000 lighting points, to a service company, on the occasion of participation in a tender. In compliance with the requirements of the CAM (minimum environmental criteria) indicated by the Ministry of the Environment, the materials that constitute all the components of the plant were analyzed, with the primary objective of drawing up a material balance and analyzing and qualifying the materials used. According to the results obtained, the lighting company has introduced circular economy oriented guidelines that have involved the whole supply chain, with the aim of improving the environmental performance of lighting systems.