An LED lighting driver having a light output mode and a standby mode, the LED lighting driver comprising: - an output for coupling to an LED lighting load; - a switched mode power supply having an energy storage inductor for delivering energy to the LED lighting load; and - an auxiliary power supply circuit comprising: a power supply inductor arrangement (L1a, L1b) magnetically coupled to the energy storage inductor and comprising a first power supply inductor (L1a) and a second power supply inductor (L1b), a rectifier diode arrangement (D1a, D1b) for delivering a rectified voltage to an auxiliary load (Caux), wherein the rectifier diode arrangement (D1a, D1b) is coupled to the power supply inductor arrangement (L1a, L1b), and a switching circuit (Q1, Q2) coupled to the rectifier diode arrangement (D1a, D1b) for selectively switching the second power supply inductor (L1b) into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the energy storage inductor, the LED lighting driver further comprising: - a controller for controlling the switching circuit (Q1, Q2) in dependence on the LED lighting driver being in the light output mode or the LED lighting driver being in the standby mode, wherein in the standby mode the LEDs of the LED lighting load are off, the LED lighting driver being characterized in that it further comprises a preload and a switch being connected in parallel to the LED lighting load, wherein in the standby mode the preload is electrically connected to the output of the LED lighting driver via the switch, to allow energy to be delivered to the auxiliary load (Caux) via the energy storage inductor. - an output for coupling to an LED lighting load; - a switched mode power supply having an energy storage inductor for delivering energy to the LED lighting load; and - an auxiliary power supply circuit comprising: a power supply inductor arrangement (L1a, L1b) magnetically coupled to the energy storage inductor and comprising a first power supply inductor (L1a) and a second power supply inductor (L1b), a rectifier diode arrangement (D1a, D1b) for delivering a rectified voltage to an auxiliary load (Caux), wherein the rectifier diode arrangement (D1a, D1b) is coupled to the power supply inductor arrangement (L1a, L1b), and a switching circuit (Q1, Q2) coupled to the rectifier diode arrangement (D1a, D1b) for selectively switching the second power supply inductor (L1b) into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the energy storage inductor, the LED lighting driver further comprising: a power supply inductor arrangement (L1a, L1b) magnetically coupled to the energy storage inductor and comprising a first power supply inductor (L1a) and a second power supply inductor (L1b), a rectifier diode arrangement (D1a, D1b) for delivering a rectified voltage to an auxiliary load (Caux), wherein the rectifier diode arrangement (D1a, D1b) is coupled to the power supply inductor arrangement (L1a, L1b), and a switching circuit (Q1, Q2) coupled to the rectifier diode arrangement (D1a, D1b) for selectively switching the second power supply inductor (L1b) into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the energy storage inductor, the LED lighting driver further comprising: - a controller for controlling the switching circuit (Q1, Q2) in dependence on the LED lighting driver being in the light output mode or the LED lighting driver being in the standby mode, wherein in the standby mode the LEDs of the LED lighting load are off, the LED lighting driver being characterized in that it further comprises a preload and a switch being connected in parallel to the LED lighting load, wherein in the standby mode the preload is electrically connected to the output of the LED lighting driver via the switch, to allow energy to be delivered to the auxiliary load (Caux) via the energy storage inductor.