Abstract: An LED assembly includes a rail device, an LED carrier with multiple LEDs securely mounted on the LED carrier and a wire extended out of the LED carrier from providing electricity to the LEDs and a plug device provided to two distal ends of the LED carrier and sandwiched in the rail device. The plug device has a passage defined in one distal end thereof to allow the wire to extend out of the plug device and a positioning seat is sandwiched in the rail device and provided to two sides of the plug device and has a receiving space to respectively and securely accommodate therein sides of the plug device.