Luminous device (100, 200, 300) for a motor vehicle, comprising at least two light sources (110,120; 210,220; 310,320) intended to contribute to the production of one and the same predetermined regulatory luminous function of the motor vehicle, of which at least one first source (110, 210, 310) is intended to be arranged on a part of the fixed rear wing of the motor vehicle, and at least one second source (120, 220, 320) is intended to be arranged on a mobile part of the vehicle, the mobile part being the boot lid of the vehicle, such that the first (110, 210, 310) and the second (120, 220, 320) sources are capable of assuming at least two distinct and predetermined relative positions (P, P') relative to one another, the first predetermined position corresponding to the closed position of the boot lid, and the second predetermined position corresponding to the open position of the boot lid, the device being such that the device comprises means for controlling the light flux (140, 240, 340) from at least one of the light sources, configured to control the emission of different light fluxes by this light source, according to the relative position of the first (110, 210, 310) and of the second (120, 220, 320) sources, and such that the means for controlling the light flux are configured to control the first and second light sources such that these sources, when they are in said first relative position, together emit a first overall light flux capable of producing said predetermined regulatory luminous function, and, when they are in said second relative position, together emit a second overall light flux, of a different intensity to the first overall light flux, capable of producing said predetermined regulatory luminous function, and the device being such that the means for controlling the light flux are configured such that the light intensity of the first source (110, 210, 310) is a lower intensity in one of the two predetermined positions (P, P') and is a higher intensity in the other of the two predetermined positions (P, P'), the light intensity of the second source (120, 220, 320) is a lower intensity in one of the two predetermined positions (P, P') and is a higher intensity in the other of the two predetermined positions (P, P'), the device being characterized in that the means for controlling the light flux (140, 240, 340) are configured such that the first (110, 210, 310) and/or the second (120, 220, 320) source emits a flux of an intensity between the lower intensity and the higher intensity when the indicated position is an intermediate position between the first position and the second predetermined position (P'). the device comprises means for controlling the light flux (140, 240, 340) from at least one of the light sources, configured to control the emission of different light fluxes by this light source, according to the relative position of the first (110, 210, 310) and of the second (120, 220, 320) sources, and such that the means for controlling the light flux are configured to control the first and second light sources such that these sources, when they are in said first relative position, together emit a first overall light flux capable of producing said predetermined regulatory luminous function, and, when they are in said second relative position, together emit a second overall light flux, of a different intensity to the first overall light flux, capable of producing said predetermined regulatory luminous function, and the device being such that the means for controlling the light flux are configured such that the light intensity of the first source (110, 210, 310) is a lower intensity in one of the two predetermined positions (P, P') and is a higher intensity in the other of the two predetermined positions (P, P'), the light intensity of the second source (120, 220, 320) is a lower intensity in one of the two predetermined positions (P, P') and is a higher intensity in the other of the two predetermined positions (P, P'), the device being characterized in that the means for controlling the light flux (140, 240, 340) are configured such that the first (110, 210, 310) and/or the second (120, 220, 320) source emits a flux of an intensity between the lower intensity and the higher intensity when the indicated position is an intermediate position between the first position and the second predetermined position (P').