Multiple organizations and boards with a global reach, such as WHO, EPA, CDC, ASHRAE and many others, recommend using UV-C rays to disinfect water, environments and air-conditioning systems. LIGHT PROGRESS is a member of the IUVA (International Ultraviolet Association), a global organisation that collects and gives users access to all available information and which organizes various international meetings each year. Having collected all this information, the IUVA has also published a document which lays the foundations for designing different UVGI (Ultraviolet Germicidal Irradiation) systems and applications.