Step 7: assemble the lamp holder, plug the thick wires to the female connector,extend one end of the female connector into the bell mouth of the stem and the thick wires shall not extend beyond the bell mouth of the stem or the length extending beyond the bell mouth of the stem shall not exceed 5 mm; weld the other end of the female connector onto the driver power supply; at the same time, install the lamp holder onto the sealing position of the bulb shell and fasten and connect by welding with mud;