US 12,109,321 B2 · System and method for reducing microorganisms

Abstract

Disclosed is a system and method for reducing microorganisms. The system comprises a light assembly and a processor. The light assembly operable to emit at least two of three different blue lights at different peak wavelengths with a full width half maximum of at most 25 nm, each peak having a time averaged intensity. The peak wavelengths are selected from 400-410 nm, 440-464 nm and 465-490 nm. The processor is communicably coupled to the light assembly to control the time averaged intensities of the blue lights emitted by the light assembly such that if two blue lights are used, the time averaged intensity of one blue light is between 0.67 and 1.33 times the time averaged intensity of another blue light; and if three blue lights are used, the time averaged intensity of any one blue light is between 0.76 and 1.24 times the time averaged intensity of the time averaged intensity of both the other blue lights.

Claims12

Dependent claims

A system for reducing microorganisms on a surface or in a volume of air, the system comprising:

a light assembly comprising:
a first distinct blue light source emitting light having a first peak wavelength of 400-410 nm with a full width half maximum of at most 25 nm, the first peak having a first time averaged intensity I1, selected to target a first photoreactive component of the microorganisms;
and
a second distinct blue light source emitting light having a second peak wavelength of 440-464 nm with a full width half maximum of at most 25 nm, the second peak having a second time averaged intensity I2, selected to target a second photoreactive component of the microorganisms;
and
a processor communicably coupled to the light assembly to control the time averaged intensities of the blue light sources such that the time averaged intensity of first blue light is between 0.67 and 1.33 times the time averaged intensity of the second blue light, wherein the processor is configured to control the light assembly to provide a combined blue light energy dose of more than 1 Ws/cm2 blue light energy at the surface or a cross-section of air.

3 more elements

A method for reducing microorganisms on a surface or in a volume of air, using a system comprising a light assembly and a processor, the method comprising:

emitting at least:
a first blue light at a first peak wavelength of 400-410 nm with a full width half maximum of at most 25 nm, the first peak having a first time averaged intensity I1, selected to target a first photoreactive component of the microorganisms;
and
a second blue light at a second peak wavelength of 440-464 nm with a full width half maximum of at most 25 nm, the second peak having a second time averaged intensity I2, selected to target a second photoreactive component of the microorganisms;
controlling the time averaged intensities of the blue lights emitted by the light assembly such that the time averaged intensity of the first blue light is between 0.67 and 1.33 times the time averaged intensity of the second blue light;
and
controlling the light assembly to provide a combined blue light energy dose of over 1 Ws/cm2 blue light energy at the surface or a cross-section of air of a volume of air for reducing microorganisms.

4 more elements

Dependencies are inferred from the claim text.

System and method for reducing microorganisms

Life of this patent

System and method for reducing microorganisms

Life of this patent

Abstract

Claims12