Lighting device

1 . A lighting device comprising:

an electrically-conductive support structure; and

a plurality of elementary lighting modules fastened to the support structure, each elementary module comprising a printed circuit board and, assembled on the printed circuit board, a LED assembly and an electronic circuit for powering and controlling the LED assembly,

wherein, in each elementary module, the printed circuit board of the module comprises at least one reference terminal, the reference terminals of the printed circuit boards of the different elementary modules being electrically connected to one another via the support structure,

wherein the elementary modules are arranged according to a plurality of columns, each comprising a plurality of elementary modules, each module comprising two power supply and control connectors, and the elementary modules of a same column being connected in a chain via their respective power supply and control connectors.

2 . The device according to claim 1 , wherein each elementary module comprises a support for fastening-the module to the support structure.

3 . The device according to claim 2 , wherein, in each elementary module, the module fastening support comprises an electrically-conductive part electrically connecting a reference terminal of the printed circuit board of the module to the support structure.

4 . The device according to claim 3 , wherein said electrically-conductive part comprises a conductive rod provided at its ends with conductive tabs, each comprising an opening crossed by a conductive rod of the support structure.

5 . The device according to claim 2 , wherein each elementary module further comprises a transparent or translucent protection casing placed in front of the printed circuit board of the module, the protection casing being fastened to said support for fastening the module.

6 . The device according to claim 1 , wherein the elementary modules are arranged according to one or a plurality of prism-shaped stages, the modules being arranged on the lateral surfaces of the prism.

7 . The device according to claim 1 , wherein the elementary modules are arranged according to a planar layout.

8 . The device according to claim 1 , further comprising an electronic power supply and control circuit connected to an end of each column.

9 . The device according to claim 8 , wherein the electronic power supply and control circuit is configured to implement a diagnosis method comprising a step of measurement of a quantity representative of at least one of a current consumed by a column or of a voltage across a column of elementary modules.

10 . The device according to claim 8 , wherein the electronic power supply and control circuit is configured to implement a diagnosis method comprising the following steps:

a) controlling an elementary module of a column to the on state and measuring a value representative of the current flowing through the column;

b) controlling said elementary module of said column in the off state and measuring a value representative of the column flowing through the column; and

c) comparing the difference between the value measured at step a) and the value measured at step b) with a nominal reference value and, if the interval between said difference and said nominal reference value exceeds a determined margin, deducing therefrom that said elementary module is defective.

11 . The device according to claim 1 , comprising a diffusing envelope surrounding the support structure and the elementary modules.

12 . The device according to claim 11 , wherein the diffusing envelope is an inflatable envelope.