What is LED Antimicrobial Lighting? They are LED fixtures that double as disinfection units. Not only do they provide light but they provide continuous environmental disinfection at 405 nanometers. This results in treatment of harmful microorganisms. Antimicrobial disinfection units tend to have multiple modes of operation; plain white light, dedicated disinfection mode, and a combination/blended version of both white light and disinfectant light.