Lamp with power switching circuit

The utility model discloses a lamp with a power switching circuit. The lamp comprises a power supply, a light-emitting module and a power adjusting structure. The power supply comprises a power supply input end, a rectification filter circuit, a power control circuit, a power supply output circuit and a power supply output end which are electrically connected, and a power switching circuit electrically connected with the power control circuit, the power switching circuit comprises a port A, a port B and a signal conversion circuit, and the signal conversion circuit is arranged between the port A and the port B; the light-emitting module is electrically connected with the power supply output end; the power adjusting structure comprises a switch S1 with a plurality of gears, the switch S1 comprises an incoming end and a plurality of outgoing ends corresponding to the plurality of gears of the switch S1, and the incoming end and the plurality of outgoing ends are electrically connected to the signal conversion c