A light source module includes light source units and links interconnecting the light source units. Each light source unit includes a substrate defining openings with a connector arranged in each opening. Each connector includes a first terminal and a second terminal. A light source is mounted on the substrate. The light source has a first electrode and a second electrode. The two electrodes are electrically connected to the terminals of the connectors. Each link is received in two openings of two neighboring light source units, and interconnects the two neighboring light source units electrically or mechanically.