An adaptable sanitizing system , comprising: a sanitizing head including an ultraviolet (UV) lamp configured to emit UV light; one or more adapter modules configured to removably couple to the sanitizing head at a coupling interface , the one or more adapter modules being configured to provide a functionality of in relation to the UV light emitted by the UV lamp , the one or more adapter modules comprising: a first adapter configured to perform a first unique functionality of optical filtering, and a second adapter module configured to perform a second unique functionality of fluid sanitizing, wherein said second adapter module comprises: a shroud that removably couples to the sanitizing head at the coupling interface; and a fluid passage in fluid communication with an inlet and an outlet within the shroud, the fluid passage being configured to receive fluid through the inlet and pass the fluid out of the outlet, the UV lamp being configured to emit the UV light into the fluid passage as the fluid passes through the fluid passage between the inlet and the outlet. a sanitizing head including an ultraviolet (UV) lamp configured to emit UV light; one or more adapter modules configured to removably couple to the sanitizing head at a coupling interface , the one or more adapter modules being configured to provide a functionality of in relation to the UV light emitted by the UV lamp , the one or more adapter modules comprising: a first adapter configured to perform a first unique functionality of optical filtering, and a second adapter module configured to perform a second unique functionality of fluid sanitizing, wherein said second adapter module comprises: a shroud that removably couples to the sanitizing head at the coupling interface; and a fluid passage in fluid communication with an inlet and an outlet within the shroud, the fluid passage being configured to receive fluid through the inlet and pass the fluid out of the outlet, the UV lamp being configured to emit the UV light into the fluid passage as the fluid passes through the fluid passage between the inlet and the outlet. a first adapter configured to perform a first unique functionality of optical filtering, and a second adapter module configured to perform a second unique functionality of fluid sanitizing, wherein said second adapter module comprises: a shroud that removably couples to the sanitizing head at the coupling interface; and a fluid passage in fluid communication with an inlet and an outlet within the shroud, the fluid passage being configured to receive fluid through the inlet and pass the fluid out of the outlet, the UV lamp being configured to emit the UV light into the fluid passage as the fluid passes through the fluid passage between the inlet and the outlet. a shroud that removably couples to the sanitizing head at the coupling interface; and a fluid passage in fluid communication with an inlet and an outlet within the shroud, the fluid passage being configured to receive fluid through the inlet and pass the fluid out of the outlet, the UV lamp being configured to emit the UV light into the fluid passage as the fluid passes through the fluid passage between the inlet and the outlet. <EOS>