This disclosure relates generally to a system, method and apparatus for the indirect electromagnetic irradiation of liquid and gaseous mediums. More specifically, this disclosure relates to a method of using a high intensity ultraviolet emitting light source that enables a high flux of selected wavelengths of far ultraviolet electromagnetic radiation to impinge on a chosen medium while simultaneously reducing or preventing exposure of said medium to undesirable heat (infrared) and other visible and near ultraviolet wavelengths. More specifically, this disclosure relates to a system and method of employing an apparatus with one or more parabolic reflectors, mirrors and/or other light focusing, filtering and redirecting means to expose a medium flowing within a UV transmitting medium transport tube to a desired wavelength or range of desired wavelengths of far ultraviolet electromagnetic radiation for the purpose of irradiating a chosen liquid and/or gaseous medium.
