Dimming circuit and lamp

The dimming circuit comprises a driving chip, the chip comprises a power supply input end and a signal input end, and the power supply input end is connected with a power supply end; the dimmer access end is used for being connected with a dimmer and comprises a signal positive electrode end and a signal negative electrode end, and the signal negative electrode end is connected with the grounding end; the state adjusting circuit comprises a first diode, a second diode, a first resistor, a second resistor and a first transistor; wherein when the dimmer is not connected, the first transistor and the second diode are cut off, and the first diode is conducted; when the light modulator is connected, the first diode is cut off, and the first transistor and the second diode are conducted. According to the embodiment of the invention, after the lamp is powered on, the wiring state of the lamp can be confirmed under the condition that the dimmer is not connected or is not turned on, and the power of the lamp can be ad