An edge connectable lighting fixture assembly has a lighting fixture housing for housing a light source and components for supporting and electrifying the light source including wiring. The housing has at least one laterally extending edge portion and a connecting structure extending along at least a portion of the length of the edge portion with a wire passageway passing through the connecting structure. An edge connector arm has at least one terminal end and a connecting structure formed on the terminal end of the arm which mechanically connects with the connecting structure formed along the edge portion of the housing so that the housing can be mechanically connected at its edge to the terminal end of the edge connector arm. A wireway in the edge connector arm extends to and exits from the terminal end of the edge connector arm such that the wireway can be aligned with the wire passageway in the connecting structure in the housing edge portion by aligning the terminal end of the edge connector arm to the wire passageway. Electrical wires can be passed from the edge connector arm through the edge portion of the housing.