Light disinfecting systems are provided in which light emanating from an end or side of an optical fiber is used to disinfect a target site. According to one implementation a light beam emanating from an end emitting optical fiber is directed into a body that includes a plurality of optical surfaces that are configured to direct at least a portion of the beam of bacterial disinfecting light to the target site. According to one implementation the plurality of optical surfaces include a first refractive optical surface, a second refractive optical surface and a total reflective surface with the total reflective optical surface being disposed between the first and second refractive optical surfaces in a designated optical pathway of the beam of bacterial disinfecting light.
