A water treatment system comprising: an actinic radiation reactor ; and at least one ultraviolet (UV) lamp disposed within a quartz tube within the actinic radiation reactor, the at least one UV lamp including: a lamp tube including a gas that emits ultraviolet light responsive to electrical excitation; a first pinch extending from a first end of the lamp tube and a second pinch extending from a second end of the lamp tube ; and a first end cap coupled to the first pinch and a second end cap coupled to the second pinch , the first end cap and second end cap dimensioned to center the lamp tube coaxially within the quartz tube ; thermally conductive biasing elements disposed about respective outer peripheries of each of the first end cap and second end cap , wherein the thermally conductive biasing elements are disposed within grooves defined within and circumscribing the outer peripheral surfaces of the first end cap and the second end cap , and, wherein the first and second end caps each include slots extending inwardly from the respective outer peripheral surfaces; and an electrical conductor disposed within the slots and configured to provide power to the lamp tube . an actinic radiation reactor ; and at least one ultraviolet (UV) lamp disposed within a quartz tube within the actinic radiation reactor, the at least one UV lamp including: a lamp tube including a gas that emits ultraviolet light responsive to electrical excitation; a first pinch extending from a first end of the lamp tube and a second pinch extending from a second end of the lamp tube ; and a first end cap coupled to the first pinch and a second end cap coupled to the second pinch , the first end cap and second end cap dimensioned to center the lamp tube coaxially within the quartz tube ; thermally conductive biasing elements disposed about respective outer peripheries of each of the first end cap and second end cap , wherein the thermally conductive biasing elements are disposed within grooves defined within and circumscribing the outer peripheral surfaces of the first end cap and the second end cap , and, wherein the first and second end caps each include slots extending inwardly from the respective outer peripheral surfaces; and an electrical conductor disposed within the slots and configured to provide power to the lamp tube . a lamp tube including a gas that emits ultraviolet light responsive to electrical excitation; a first pinch extending from a first end of the lamp tube and a second pinch extending from a second end of the lamp tube ; and a first end cap coupled to the first pinch and a second end cap coupled to the second pinch , the first end cap and second end cap dimensioned to center the lamp tube coaxially within the quartz tube ; thermally conductive biasing elements disposed about respective outer peripheries of each of the first end cap and second end cap , wherein the thermally conductive biasing elements are disposed within grooves defined within and circumscribing the outer peripheral surfaces of the first end cap and the second end cap , and, wherein the first and second end caps each include slots extending inwardly from the respective outer peripheral surfaces; and an electrical conductor disposed within the slots and configured to provide power to the lamp tube . <EOS>