A light emitter assembly includes a base body, a base electrical connector disposed on the base body, and a light emitter disposed on the base body and electrically connected to the base electrical connector. The light emitter assembly also includes a light housing disposed on the base body and housing the light emitter, and a power receptacle and/or a communication receptacle disposed on the light housing and electrically connected to the base electrical connector. The light housing is configured to allow passage of light therethrough.