Abstract: Germicidal light fixtures and germicidal light fixture systems. One embodiment of a germicidal light fixture includes a support structure and at least one first lighting device coupled with the support structure operative to emit ultraviolet radiation at a first predetermined wavelength. At least one second lighting device is coupled with the support structure and is operative to emit ultraviolet radiation at a second predetermined wavelength. The first and second predetermined wavelengths are selected such that ultraviolet radiation emitted from the at least one first lighting device and from the at least one second lighting device, respectively, is operative to inactivate microorganisms. At least one third lighting device is coupled with the support structure and is operative to emit visible radiation.