Extension bar with built-in light

An extension bar with built-in light, comprising:

• an elongate body made by conductive material and having a first end and an engaging recess defined in a second end of the elongate body, a transverse hole defined through the elongate body and communicating with the engaging recess, a passage defined axially through the elongate body and communicating with the engaging recess and defining an opening in the first end of the elongate body;
• a switch member made by non-conductive material and extending through the transverse hole, the switch member including a first face toward the first end of the elongate body and a second face toward the second end of the elongate body, the switch member being arranged at a first operation position and a second operation position in the transverse hole, a first recess defined in the switch member and a first conductive member engaged with the first recess, a second recess defined in the switch member and a second conductive member engaged with the second recess;
• a power supply unit and a light bulb received in the passage, the power supply unit having a first end facing the switch member and a second end of the power supply unit facing a first end of the light bulb, the first end of the light bulb made by conductive material and being in contact with an inner periphery of the passage, a second end of the light bulb facing the opening in the first end of the elongate body;
• the first conductive member including a first conductive portion and a second conductive portion, the first conductive portion being in contact with the elongate body and the second conductive portion being removably in contact with the first end of the power supply unit, the second conductive member having a third conductive portion and a fourth conductive portion, the third conductive portion located in the first face of the switch member and the fourth conductive portion located in the second face of the switch member, and
• when the switch member is located at the first operation position, the third conductive portion of the second conductive member is in contact with the power supply unit, a conductive hand tool is inserted into the engaging recess and in contact with the elongate body and the fourth conductive portion of the second conductive member so as to form a first circuit via the conductive hand tool, the elongate body, the second conductive member, the power supply unit and the light bulb, the light bulb is activated, when the switch member is located at the second operation position, the first conductive portion of the first conductive member is in contact with the elongate body and the second conductive portion of the first conductive member is in contact with the power supply unit so as to form a second circuit via the first conductive member, the power supply unit and the light bulb and the elongate body, the light bulb is activated.