The present invention disclosed a light module, which comprises a plurality of LED package units and a plurality of connecting units. Opposite sides of each of the LED package units has one connector respectively, and opposite sides of each of the connecting units has one connector respectively. The LED package unit and the connecting unit connect each other through the connectors. To vary the arrangement and the amount of the connecting units and the LED package units is to suit different dimensions of side light modules of liquid crystal displays with different luminosities.