An LED lighting system, comprising: a voltage source; an electronic switch in series with the voltage source, controlled by a pulse width modulation, PWM, driving signal; a bypass branch in parallel with the electronic switch; and an LED lighting module in series with the voltage source and the electronic switch, the LED lighting module comprising: a constant current drive circuit; and an LED group comprising a plurality of LEDs connected in series, wherein the constant current drive circuit is a linear constant current converter; wherein the constant current drive circuit is configured to receive a power from supply rails comprising a supply voltage and a ground voltage, said supply rails being derived from the output of the voltage source in series with the electronic switch which electronic switch is in parallel with the bypass branch, said constant current drive circuit being connected between the supply rails; wherein the LED group and a transistor of the constant current drive circuit are connected in series between the supply rails; wherein the constant current drive circuit is adapted to drive a constant current through the LED group by regulating a conduction state of the transistor; and wherein the bypass branch is adapted such that, when the electronic switch is open, the power delivered to the constant current drive circuit is sufficient to maintain the constant current drive circuit powered, wherein the bypass branch is adapted so that a voltage drop across the bypass branch results in a voltage across the LED group being below a combined threshold voltage of the LEDs when the electronic switch is open. a voltage source; an electronic switch in series with the voltage source, controlled by a pulse width modulation, PWM, driving signal; a bypass branch in parallel with the electronic switch; and an LED lighting module in series with the voltage source and the electronic switch, the LED lighting module comprising: a constant current drive circuit; and an LED group comprising a plurality of LEDs connected in series, wherein the constant current drive circuit is a linear constant current converter; a constant current drive circuit; and an LED group comprising a plurality of LEDs connected in series, wherein the constant current drive circuit is a linear constant current converter; wherein the constant current drive circuit is configured to receive a power from supply rails comprising a supply voltage and a ground voltage, said supply rails being derived from the output of the voltage source in series with the electronic switch which electronic switch is in parallel with the bypass branch, said constant current drive circuit being connected between the supply rails; wherein the LED group and a transistor of the constant current drive circuit are connected in series between the supply rails; wherein the constant current drive circuit is adapted to drive a constant current through the LED group by regulating a conduction state of the transistor; and wherein the bypass branch is adapted such that, when the electronic switch is open, the power delivered to the constant current drive circuit is sufficient to maintain the constant current drive circuit powered, wherein the bypass branch is adapted so that a voltage drop across the bypass branch results in a voltage across the LED group being below a combined threshold voltage of the LEDs when the electronic switch is open.