An LED array switching apparatus, comprising: a plurality of LED arrays (D1 to Dn) arranged in a serial path, each LED array having a forward voltage; a voltage supply coupled to the plurality of LED arrays; a switch; a voltage comparator that compares the voltage of the voltage supply with a reference voltage (Vref) and controls the switch to open when the voltage of the voltage supply is greater than or equal to the reference voltage; and a plurality of current sources (G1 to Gn) selectively coupled to the LED arrays, each of the current sources being switchable between a current regulating state and an open state, the voltage comparator, the switch and current sources cooperating together such that: (a) when the voltage of the voltage supply is below the reference voltage, the switch is closed and the current sources are controlled so as to break the serial path into a plurality of parallel paths each including less than all of the LED arrays, and (b) when the voltage of the voltage supply is greater than or equal to the reference voltage, as the voltage of the voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, wherein current through LED arrays is regulated by associated current sources of said plurality of current sources, and as the voltage of the voltage supply decreases, LED arrays are sequentially switched off and removed from the LED string starting with the most recently lit array; wherein each current source comprises: a transistor having a gate, a drain, and a source, wherein the drain of the transistor is coupled to its respective LED array; a first resistor coupled to the gate of the transistor; a second resistor coupled to the source of the transistor; and a zener diode coupled between the gate and the source of the transistor. a plurality of LED arrays (D1 to Dn) arranged in a serial path, each LED array having a forward voltage; a voltage supply coupled to the plurality of LED arrays; a switch; a voltage comparator that compares the voltage of the voltage supply with a reference voltage (Vref) and controls the switch to open when the voltage of the voltage supply is greater than or equal to the reference voltage; and a plurality of current sources (G1 to Gn) selectively coupled to the LED arrays, each of the current sources being switchable between a current regulating state and an open state, the voltage comparator, the switch and current sources cooperating together such that: (a) when the voltage of the voltage supply is below the reference voltage, the switch is closed and the current sources are controlled so as to break the serial path into a plurality of parallel paths each including less than all of the LED arrays, and (b) when the voltage of the voltage supply is greater than or equal to the reference voltage, as the voltage of the voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, wherein current through LED arrays is regulated by associated current sources of said plurality of current sources, and as the voltage of the voltage supply decreases, LED arrays are sequentially switched off and removed from the LED string starting with the most recently lit array; (a) when the voltage of the voltage supply is below the reference voltage, the switch is closed and the current sources are controlled so as to break the serial path into a plurality of parallel paths each including less than all of the LED arrays, and (b) when the voltage of the voltage supply is greater than or equal to the reference voltage, as the voltage of the voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, wherein current through LED arrays is regulated by associated current sources of said plurality of current sources, and as the voltage of the voltage supply decreases, LED arrays are sequentially switched off and removed from the LED string starting with the most recently lit array; wherein each current source comprises: a transistor having a gate, a drain, and a source, wherein the drain of the transistor is coupled to its respective LED array; a first resistor coupled to the gate of the transistor; a second resistor coupled to the source of the transistor; and a zener diode coupled between the gate and the source of the transistor. a transistor having a gate, a drain, and a source, wherein the drain of the transistor is coupled to its respective LED array; a first resistor coupled to the gate of the transistor; a second resistor coupled to the source of the transistor; and a zener diode coupled between the gate and the source of the transistor.