US Patent 10918747 Disinfecting lighting device

Methods, systems, and devices for inactivating microorganisms are disclosed. An example method comprises emitting, with a first light source, a first light comprising a first correlated color temperature (CCT), emitting, with a second light source, a second light comprising a second CCT and, varying respective power levels of the first light source and the second light source such that the first light and the second light combine to form white light comprising an intensity associated with light in a 380-420 nanometer (nm) wavelength range sufficient to initiate inactivation of microorganisms on the surface and a third CCT between the first CCT and the second CCT.