Abstract: An infrared sensor assembly for adjusting a light output of a light source is provided. The infrared sensor assembly is configured to be mounted to a substrate and includes a housing that defines a chamber in which an infrared sensor is located. The housing includes a body and a tubular connector projecting from the body. The tubular connector includes at least one external thread that extends proximate to a free open end of the tubular connector. The infrared sensor assembly includes a lens or a lens assembly threadably attached to the tubular connector. The lens or the lens assembly includes a base with an annular groove. The infrared sensor assembly further includes a gasket received within the annular groove of the lens or the lens assembly and an internally threaded locking ring that is configured to be threadably received by the tubular connector to secure the infrared sensor assembly to the substrate.