Single-emitter lighting device that outputs a minimum amount of power to produce integrated radiance values sufficient for deactivating pathogens

A method of providing doses of light sufficient to deactivate MRSA bacteria throughout a volumetric space over a period of time, the method comprising:

• installing an arrangement of one or more lighting fixtures in the volumetric space, each of the one or more lighting fixtures configured to at least partially provide, via at least one lighting element, disinfecting light having a wavelength of about 405 nm;
• and
• applying, via the one or more lighting fixtures, a determined radiometric power to the volumetric space, wherein the determined radiometric power produces a minimum power density measured at any exposed surface within the volumetric space during the period of time, the minimum power density comprising a minimum integrated irradiance of the disinfecting light equal to 0.01 mW/cm2,
• wherein applying the determined radiometric power comprises providing light from the at least one lighting element of each of the one or more lighting fixtures, wherein the light provided the at least one lighting element is produced from a single light source, wherein at least a first component of the light is the disinfecting light, and wherein at least a second component of the light has a wavelength of greater than 420 nm.

A lighting system configured to deactivate MRSA bacteria in a volumetric space over a period of time, the lighting system comprising:

• one or more lighting fixtures each configured at least partially to provide, via at least one lighting element, disinfecting light having a wavelength of about 405 nm;
• and
• one or more control devices configured to:
• receive first data associated with a desired illuminance level for the volumetric space, and second data indicative of desired correlated color temperature for the volumetric space,
• determine, based on the first and second data, an arrangement of the one or more lighting fixtures in the volumetric space,
• determine, based on the second data and the volumetric space, a total radiometric power to be applied via the one or more lighting fixtures to produce a desired power density measured at any exposed surface within the volumetric space during the period of time, the desired power density comprising a minimum integrated irradiance of the disinfecting light equal to 0.01 mW/cm2, and
• cause the at least one lighting element of each of the one or more lighting fixtures to provide light, wherein the light provided by the at least one lighting element is produced from a single light source, wherein at least a first component of the light is the disinfecting light, and wherein at least a second component of the light has a wavelength of greater than 420 nm.