An electroluminescent light source with an adjusted or adjustable luminance parameter ((I, L), (V,L),...), wherein: - said source includes a set of N segments (S i), where N>2, each segment having an emission area and comprising a discrete electroluminescent element or multiple discrete electroluminescent elements connected permanently to one another with: ∘ either said source comprising filamentous (NT i), conical, frustoconical or pyramidal elements on the surface of a substrate and distributed in subsets corresponding to said segments, each segment possessing a different number of filamentous, conical, frustoconical or pyramidal elements connected permanently to one another, said discrete electroluminescent elements being said filamentous, conical, frustoconical or pyramidal elements; ∘ either said source comprising a light-emitting diode having an emissive active portion that is segmented so as to define said segments (S i), said light-emitting diode having a planar structure of stacked layers (203, 202) on the surface of a substrate, the segments having different areas, each segment being a discrete electroluminescent element; ∘ either said source comprising an assembly of discrete light-emitting diode chips, distributed between said segments, each segment consisting of at least one chip, the segments comprising a different number of light-emitting diode (LEDs) chips connected permanently to one another or light-emitting diode (LEDs) chips of different sizes, said discrete electroluminescent elements being said discrete light-emitting diode chips; - said source comprising means for controlling at least a portion of said segments (S i); characterized in that - said segments have emission areas varying by power of 2. - said source includes a set of N segments (S i), where N>2, each segment having an emission area and comprising a discrete electroluminescent element or multiple discrete electroluminescent elements connected permanently to one another with: ∘ either said source comprising filamentous (NT i), conical, frustoconical or pyramidal elements on the surface of a substrate and distributed in subsets corresponding to said segments, each segment possessing a different number of filamentous, conical, frustoconical or pyramidal elements connected permanently to one another, said discrete electroluminescent elements being said filamentous, conical, frustoconical or pyramidal elements; ∘ either said source comprising a light-emitting diode having an emissive active portion that is segmented so as to define said segments (S i), said light-emitting diode having a planar structure of stacked layers (203, 202) on the surface of a substrate, the segments having different areas, each segment being a discrete electroluminescent element; ∘ either said source comprising an assembly of discrete light-emitting diode chips, distributed between said segments, each segment consisting of at least one chip, the segments comprising a different number of light-emitting diode (LEDs) chips connected permanently to one another or light-emitting diode (LEDs) chips of different sizes, said discrete electroluminescent elements being said discrete light-emitting diode chips; ∘ either said source comprising filamentous (NT i), conical, frustoconical or pyramidal elements on the surface of a substrate and distributed in subsets corresponding to said segments, each segment possessing a different number of filamentous, conical, frustoconical or pyramidal elements connected permanently to one another, said discrete electroluminescent elements being said filamentous, conical, frustoconical or pyramidal elements; ∘ either said source comprising a light-emitting diode having an emissive active portion that is segmented so as to define said segments (S i), said light-emitting diode having a planar structure of stacked layers (203, 202) on the surface of a substrate, the segments having different areas, each segment being a discrete electroluminescent element; ∘ either said source comprising an assembly of discrete light-emitting diode chips, distributed between said segments, each segment consisting of at least one chip, the segments comprising a different number of light-emitting diode (LEDs) chips connected permanently to one another or light-emitting diode (LEDs) chips of different sizes, said discrete electroluminescent elements being said discrete light-emitting diode chips; - said source comprising means for controlling at least a portion of said segments (S i); characterized in that - said segments have emission areas varying by power of 2.