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 ( OUT ) 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 ( OUT ), and - an input terminal ( IN ) 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 ( IN ) and said second positive terminal ( L2+ ) to selectively connect said input terminal ( IN ) 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 ( OUT ) 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 ( OUT ), and - an input terminal ( IN ) for receiving a further power supply signal from said further power supply module (50 2 ); and - an output terminal ( OUT ) 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 ( OUT ), and - an input terminal ( IN ) 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 ( IN ) and said second positive terminal ( L2+ ) to selectively connect said input terminal ( IN ) to said second positive terminal ( L2+ ). <EOS>