• M Maclean, K McKenzie, J G Anderson, G Gettinby, and S J MacGregor.
• The Robertson Trust Laboratory for Electronic Sterilisation Technologies, University of Strathclyde, Glasgow, UK. Electronic address: michelle.maclean@strath.ac.uk.
• J. Hosp. Infect. 2014 Sep 1;88(1):1-11.

BackgroundAlthough the germicidal properties of ultraviolet (UV) light have long been known, it is only comparatively recently that the antimicrobial properties of visible violet-blue 405 nm light have been discovered and used for environmental disinfection and infection control applications.AimTo review the antimicrobial properties of 405 nm light and to describe its application as an environmental decontamination technology with particular reference to disinfection of the hospital environment.MethodsExtensive literature searches for relevant scientific papers and reports.FindingsA large body of scientific evidence is now available that provides underpinning knowledge of the 405 nm light-induced photodynamic inactivation process involved in the destruction of a wide range of prokaryotic and eukaryotic microbial species, including resistant forms such as bacterial and fungal spores. For practical application, a high-intensity narrow-spectrum light environmental disinfection system (HINS-light EDS) has been developed and tested in hospital isolation rooms. The trial results have demonstrated that this 405 nm light system can provide continuous disinfection of air and exposed surfaces in occupied areas of the hospital, thereby substantially enhancing standard cleaning and infection control procedures.ConclusionViolet-blue light, particularly 405 nm light, has significant antimicrobial properties against a wide range of bacterial and fungal pathogens and, although germicidal efficacy is lower than UV light, this limitation is offset by its facility for safe, continuous use in occupied environments. Promising results on disinfection efficacy have been obtained in hospital trials but the full impact of this technology on reduction of healthcare-associated infection has yet to be determined.Copyright © 2014 The Healthcare Infection Society. Published by Elsevier Ltd. All rights reserved.

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