A system for connecting luminaires is provided. The system includes: a first luminaire having an end face having a first slot; a second luminaire having an end face having a second slot; a first elongated joining member having first prongs. The first slot and second slot are in laterally aligned and joined relationship define a first joining member slot having a first wedged end, and the first wedged end is shaped to provide an interference fit with the first prongs wherein advancing the first prongs against the first wedged end forces the first slot and the second slot toward each other to tighten connection between the first luminaire and the second luminaire.