A lighting device, comprising: - an elongated support member comprising a sequence of consecutive segments, the segments having a first end and a second end opposed lengthwise of the elongated support member, - light radiation sources adapted to be electrically-powered and which are distributed along the elongated support member in a sequence of electrical units arranged at respective segments of the elongated support member, the electrical units comprising a first supply node (LED+) and a second supply node (LED-), wherein at least one electrical unit in the sequence of electrical units comprises: - a plurality of sets of light radiation sources (D11, D12, D13; D21, D22, D23; D11, D12, D13, D21; D22, D23); adapted to be electrically-powered and arranged electrically in series between the first supply node (LED+) and the second supply node (LED-) of the electrical unit, with at least one set (D21, D22, D23; D22, D23) of light radiation sources arranged at one of the first end and the second end of the respective segment of the elongated support member severable from the electrical unit at a cutting line (LC1, LC2) of the elongated support member intermediate the first end and the second end of the respective segment of the elongated support member, - an electrically conductive path (12, 13) in parallel to said at least one severable set (D21, D22, D23; D22, D23) of light radiation sources, the electrically conductive path activatable as a result of the at least one severable set (D21, D22, D23; D22, D23) being severed from the electrical unit at said cutting line (LC1, LC2) of the elongated support member, with electrical coupling of the first supply node (LED+) and the second supply node (LED-) maintained by the activated electrically conductive path (12, 13), wherein the electrically conductive path comprises an electronic switch (12, 13) adapted to switch between: - a first, non-conductive, state with the at least one severable set of light radiation sources (D21, D22, D23; D22, D23) coupled to the respective electrical unit, and - a second, conductive, state with the at least one severable set of light radiation sources (D21, D22, D23; D22, D23) severed from the respective electrical unit, characterized in that - at least one electrical unit in the sequence of electrical units comprises a current regulator coupled to a set (D11, D12, D13; D11, D12, D13, D21) of light radiation sources in said plurality of sets of light radiation sources adapted to be electrically-powered (D11, D12, D13; D21, D22, D23; D11, D12, D13, D21; D22, D23) other than said at least one set (D21, D22, D23; D22, D23) severable from the electrical unit, - said at least one severable set of light radiation sources (D21, D22, D23; D22, D23) has an operational voltage drop therethrough, and - the electronic switch comprises a Zener diode (12, 13) having Zener voltage higher than said operational voltage drop. - an elongated support member comprising a sequence of consecutive segments, the segments having a first end and a second end opposed lengthwise of the elongated support member, - light radiation sources adapted to be electrically-powered and which are distributed along the elongated support member in a sequence of electrical units arranged at respective segments of the elongated support member, the electrical units comprising a first supply node (LED+) and a second supply node (LED-), - a plurality of sets of light radiation sources (D11, D12, D13; D21, D22, D23; D11, D12, D13, D21; D22, D23); adapted to be electrically-powered and arranged electrically in series between the first supply node (LED+) and the second supply node (LED-) of the electrical unit, with at least one set (D21, D22, D23; D22, D23) of light radiation sources arranged at one of the first end and the second end of the respective segment of the elongated support member severable from the electrical unit at a cutting line (LC1, LC2) of the elongated support member intermediate the first end and the second end of the respective segment of the elongated support member, - an electrically conductive path (12, 13) in parallel to said at least one severable set (D21, D22, D23; D22, D23) of light radiation sources, the electrically conductive path activatable as a result of the at least one severable set (D21, D22, D23; D22, D23) being severed from the electrical unit at said cutting line (LC1, LC2) of the elongated support member, with electrical coupling of the first supply node (LED+) and the second supply node (LED-) maintained by the activated electrically conductive path (12, 13), - a first, non-conductive, state with the at least one severable set of light radiation sources (D21, D22, D23; D22, D23) coupled to the respective electrical unit, and - a second, conductive, state with the at least one severable set of light radiation sources (D21, D22, D23; D22, D23) severed from the respective electrical unit, - at least one electrical unit in the sequence of electrical units comprises a current regulator coupled to a set (D11, D12, D13; D11, D12, D13, D21) of light radiation sources in said plurality of sets of light radiation sources adapted to be electrically-powered (D11, D12, D13; D21, D22, D23; D11, D12, D13, D21; D22, D23) other than said at least one set (D21, D22, D23; D22, D23) severable from the electrical unit, - said at least one severable set of light radiation sources (D21, D22, D23; D22, D23) has an operational voltage drop therethrough, and - the electronic switch comprises a Zener diode (12, 13) having Zener voltage higher than said operational voltage drop.