Patent Document ID: 9668317
Application ID: 15140960
Patent Flag: 1

Claim One:
1. A light device for a motor vehicle, said light device comprising; driving means for powering a plurality of light-emitting diodes, LEDs, mounted in series, each of said LEDs being characterized by the same forward voltage V f dependent on its junction temperature; first means for measuring said junction temperature of said LEDs; second means for measuring an electrical voltage at the terminals of an assembly; and processing means for detecting a failure of at least one of said LEDs of said assembly; wherein said processing means are configured to: compare said electrical voltage at said terminals of said assembly measured at a first given instant to said electrical voltage at said terminals of said assembly measured at a second given instant, said comparison being conditional on the identity of said junction temperature of said LEDs measured at said first and second instants; and detect a failure of at least one of said LEDs of said assembly as a function of said comparison.