A power supply for a LED light source, said power supply comprising: a power converter to provide a regulated power including a LED current and a LED voltage to the LED light source; an LED current sensor (25, R1) arranged to provide a sensed current indicative of a magnitude of the LED current flowing through the LED light source; a feedback controller (27, 125), wherein the LED current sensor (25, R1) is arranged to feed the sensed current to the feedback controller (27, 125), and the feedback controller (27, 125) is arranged to provide a feedback signal to the power converter, in order to control the LED current included in the regulated power that is provided by the power converter to the LED source (10, 110); a LED control switch to control a flow of the LED current through the LED light source, wherein said LED control switch includes a first switch and a second switch, the first switch establishing a current path from the LED light source to said power converter when the LED current is below a peak threshold; and a LED PWM dimmer to provide a pulse width modulation signal to said first switch in response to an external dim command to thereby dim the light source; characterized in that: the LED current sensor (25, R1) is arranged to provide the sensed current to both the feedback controller (27, 125) and the second switch, and in addition to the sensed current being used to provide said feedback signal in order to control the LED current included in said regulated power, the second switch is arranged to operate the first switch to turn off when the second switch is turned on and thereby limit the peak of the LED current to a safe level when the sensed LED current exceeds the peak threshold upon the LED light source being connected to the power supply subsequent to an energizing of the power supply. a power converter to provide a regulated power including a LED current and a LED voltage to the LED light source; an LED current sensor (25, R1) arranged to provide a sensed current indicative of a magnitude of the LED current flowing through the LED light source; a feedback controller (27, 125), wherein the LED current sensor (25, R1) is arranged to feed the sensed current to the feedback controller (27, 125), and the feedback controller (27, 125) is arranged to provide a feedback signal to the power converter, in order to control the LED current included in the regulated power that is provided by the power converter to the LED source (10, 110); a LED control switch to control a flow of the LED current through the LED light source, wherein said LED control switch includes a first switch and a second switch, the first switch establishing a current path from the LED light source to said power converter when the LED current is below a peak threshold; and a LED PWM dimmer to provide a pulse width modulation signal to said first switch in response to an external dim command to thereby dim the light source; the LED current sensor (25, R1) is arranged to provide the sensed current to both the feedback controller (27, 125) and the second switch, and in addition to the sensed current being used to provide said feedback signal in order to control the LED current included in said regulated power, the second switch is arranged to operate the first switch to turn off when the second switch is turned on and thereby limit the peak of the LED current to a safe level when the sensed LED current exceeds the peak threshold upon the LED light source being connected to the power supply subsequent to an energizing of the power supply.