A lamp, including: a lamp cover, the lamp cover is in the shape of a strip having openings at both ends, and the lamp cover is respectively provided with two side walls (11, 12) and a top surface along a direction away from the light emitting surface, and the two side walls (11, 12) and the top surface form an accommodating cavity, the two side walls (11, 12) and the top surface being integral parts of the lamp cover; a PCB board, the PCB board being mounted in the accommodating cavity along the length direction of the lamp cover; wherein the lamp also includes a conductive component connected to an external power supply, and the conductive component is electrically connected to the PCB board; the conductive component includes two conducting plates each having a support leg (311, 312) formed at one end of the respective conducting plate, wherein the two support legs (311, 312) are embedded in corresponding holes on the PCB board respectively to electrically connect with the positive and negative electrode circuit of the PCB board, and the other end of the respective conducting plate is electrically connected with an external power supply, wherein the conductive component is partially located in the accommodating cavity and partially located outside the accommodating cavity; two sides of each end of the conducting plates are exposed outside the conductive component respectively; the two side walls (11, 12) are provided with grooves formed along the length direction of the lamp cover; grooves are provided with conductive rods electrically connecting to a corresponding side of the conducting plates exposed outside the conductive component to realize the cascade lamps to conduct electricity through the electrical connection between the conductive rod and the conductive plate when the lamps is cascaded. a lamp cover, the lamp cover is in the shape of a strip having openings at both ends, and the lamp cover is respectively provided with two side walls (11, 12) and a top surface along a direction away from the light emitting surface, and the two side walls (11, 12) and the top surface form an accommodating cavity, the two side walls (11, 12) and the top surface being integral parts of the lamp cover; a PCB board, the PCB board being mounted in the accommodating cavity along the length direction of the lamp cover; wherein the lamp also includes a conductive component connected to an external power supply, and the conductive component is electrically connected to the PCB board; the conductive component includes two conducting plates each having a support leg (311, 312) formed at one end of the respective conducting plate, wherein the two support legs (311, 312) are embedded in corresponding holes on the PCB board respectively to electrically connect with the positive and negative electrode circuit of the PCB board, and the other end of the respective conducting plate is electrically connected with an external power supply, wherein the conductive component is partially located in the accommodating cavity and partially located outside the accommodating cavity; two sides of each end of the conducting plates are exposed outside the conductive component respectively; the two side walls (11, 12) are provided with grooves formed along the length direction of the lamp cover; grooves are provided with conductive rods electrically connecting to a corresponding side of the conducting plates exposed outside the conductive component to realize the cascade lamps to conduct electricity through the electrical connection between the conductive rod and the conductive plate when the lamps is cascaded.