A power supply module (50 1) for a lighting system, said power supply module (50 1) comprising: - an electronic converter comprising a positive terminal and a negative terminal, wherein said electronic converter is configured to generate a power supply signal ( V out; i out) at said positive terminal and said negative terminal; and - a first positive terminal ( L1+) and a first negative terminal ( L1 -) adapted to be connected to a first lighting module, wherein said first negative terminal ( L1 -) is connected to said negative terminal of said electronic converter; - a second positive terminal (L2+) for connection to a second lighting module; characterized in that said power supply module (50 1) comprises: - one or more terminals (IN, OUT; I / O) comprising - an output terminal for providing the power ( V out; i out) generated by said electronic converter to a further power supply module (50 2), wherein said positive terminal of said electronic converter is connected to said output terminal, and - an input terminal for receiving a further power supply signal from said further power supply module (50 2); and - switching means configured to selectively connect the positive terminal of said electronic converter to said first positive terminal ( L1+) or said second positive terminal (L2+), and wherein said switching means further comprises an electronic switch (SWc) connected between said input terminal and said second positive terminal ( L2+) to selectively connect said input terminal to said second positive terminal ( L2+). - an electronic converter comprising a positive terminal and a negative terminal, wherein said electronic converter is configured to generate a power supply signal ( V out; i out) at said positive terminal and said negative terminal; and - a first positive terminal ( L1+) and a first negative terminal ( L1 -) adapted to be connected to a first lighting module, wherein said first negative terminal ( L1 -) is connected to said negative terminal of said electronic converter; - a second positive terminal (L2+) for connection to a second lighting module; - one or more terminals (IN, OUT; I / O) comprising - an output terminal for providing the power ( V out; i out) generated by said electronic converter to a further power supply module (50 2), wherein said positive terminal of said electronic converter is connected to said output terminal, and - an input terminal for receiving a further power supply signal from said further power supply module (50 2); and - an output terminal for providing the power ( V out; i out) generated by said electronic converter to a further power supply module (50 2), wherein said positive terminal of said electronic converter is connected to said output terminal, and - an input terminal for receiving a further power supply signal from said further power supply module (50 2); and - switching means configured to selectively connect the positive terminal of said electronic converter to said first positive terminal ( L1+) or said second positive terminal (L2+), and wherein said switching means further comprises an electronic switch (SWc) connected between said input terminal and said second positive terminal ( L2+) to selectively connect said input terminal to said second positive terminal ( L2+).