A water treatment system comprising: an actinic radiation reactor; and at least one ultraviolet 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 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.