A light module for an interior rearview mirror assembly is positionable at least partially within the mirror casing. The light module includes an illumination source, a housing generally surrounding the illumination source, and a cover generally encasing the illumination source within the housing. The light module includes an electrical connector for electrically connecting the light module to an electrical conductor of the mirror assembly when the light module is positioned at least partially within the mirror casing. The light module may include a user actuatable input for activating and deactivating the illumination source. The electrical connector may comprise conductive elements that are molded within a polymeric housing. The conductive elements may include light contacts for electrically contacting the illumination source and may be configured to support the illumination source. The illumination source may comprise a festoon light source.