a power factor correction circuit configured to receive an input signal and provide a DC bus voltage across a DC bus;

a converter configured to receive the DC bus voltage and to output a DC output voltage for powering at least one LED, wherein the converter comprises a high-side transistor, wherein the high-side transistor is OFF when the LED power supply is in standby;

a voltage sensor being configured to output a voltage sensor output;

a controller configured to receive the voltage sensor output and to output a control signal according to the voltage sensor output, wherein the voltage sensor is positioned in series with the output of the high-side transistor of the converter, such that, when the high-side transistor is ON, the voltage sensor output is proportional to the DC bus voltage, and when the high-side transistor is OFF, the voltage sensor is disconnected from the DC bus; a peak detector disposed such that the voltage sensor output is proportional to a peak of the DC bus voltage; and, wherein the peak detector is disposed between the output of the high-side transistor of the converter and the voltage sensor;

a second voltage sensor being configured to output a second voltage sensor output; and

a second controller configured to receive the second voltage sensor output and to output a second control signal according to the second voltage sensor output, wherein the second voltage sensor is positioned in series with the output of the high-side transistor, such that, when the high-side transistor is ON, the second voltage sensor output is proportional to the DC bus voltage, and when the high-side transistor is OFF, the second voltage sensor is disconnected from the DC bus.