When the light is off, first make sure the circuit is okay. If it is a newly installed lamp, use an electric pen to measure it, or install an incandescent lamp to see if there is voltage in the circuit. After confirming that the circuit is okay, you can start the following maintenance
The lights are off, and in all likelihood the problem is with the drive. Light-emitting diodes have high requirements on current and voltage. Currents and voltages that are too large or too small do not light up properly. Therefore, constant current drivers, rectifiers, and buck-boost devices in drivers are required to be used.
If the lamp does not turn on after turning on the lamp, the driver should be considered first. A new drive can be purchased for replacement at this time