A light cover for mounting to a downlight trim installed on a ceiling. A light guide plate is mounted to the downlight trim. The downlight trim has an opening therethrough through which the light guide plate extends. The downlight trim projects outward from the light guide plate so that a diffusion plate of the light guide plate extends outward from the downlight trim. The light cover has a circular opening therethrough through which the diffusion plate of the light guide plate extends so as to light up the light cover. The light cover has a collar which extends from an outer front facing surface of the light cover towards the rear facing surface of the light cover.