A headlight includes light sources, and phase modulation elements that diffract lights incident from the light sources with changeable phase modulation patterns. The lights diffracted by the phase modulation elements are emitted with a low beam light distribution pattern that is a predetermined light distribution pattern based on the phase modulation patterns. A projection region on which zeroth order lights, that are emitted from the phase modulation elements without being diffracted by the phase modulation elements, among the lights incident on the phase modulation elements, are projected is located within a range where a driver's view of a vehicle is obstructed by the vehicle.

A headlight includes light sources, and phase modulation elements that diffract lights incident from the light sources with changeable phase modulation patterns. The lights diffracted by the phase modulation elements are emitted with a low beam light distribution pattern that is a predetermined light distribution pattern based on the phase modulation patterns. A projection region on which zeroth order lights, that are emitted from the phase modulation elements without being diffracted by the phase modulation elements, among the lights incident on the phase modulation elements, are projected is located within a range where a driver's view of a vehicle is obstructed by the vehicle.

A vehicular headlight (20) includes a first light source unit (41), a second light source unit (61), a temperature sensor (47), and a control unit (110). When the temperature derating is performed on the first light source unit (41) based on the temperature in a state where the light distribution pattern (910) of a low-beam is formed, the control unit (110) controls the power to be supplied to each of a plurality of light-emitting elements (43) so that the light amount of at least a part of the first light with which at least a region (911) of a first light distribution pattern (400) is irradiated decreases as compared with that before the temperature derating.

A vehicular headlight (20) includes a first light source unit (41), a second light source unit (61), a temperature sensor (47), and a control unit (110). When the temperature derating is performed on the first light source unit (41) based on the temperature in a state where the light distribution pattern (910) of a low-beam is formed, the control unit (110) controls the power to be supplied to each of a plurality of light-emitting elements (43) so that the light amount of at least a part of the first light with which at least a region (911) of a first light distribution pattern (400) is irradiated decreases as compared with that before the temperature derating.

An illuminant (1) for a motor vehicle headlight includes an SMD component (2) and a circuit carrier (4). The SMD component (2) is connected to the circuit carrier (4) by means of a solder connection, wherein the circuit carrier has a plurality of contact elements (5a), wherein in order to dissipate waste heat from the SMD component (2), the circuit carrier (4) has a plurality of micro-vias (7) designed for heat conduction, wherein a number of contact elements (5a) have a substantially hexagonal base (5b), wherein the micro-vias (7) are arranged in a two-dimensional hexagonal packing arrangement with respect to one another in such a way that the substantially hexagonal bases (5b) of the contact elements (5a) are interspersed by a plurality of micro-vias (7) substantially completely, according to the highest area packing density.

An illuminant (1) for a motor vehicle headlight includes an SMD component (2) and a circuit carrier (4). The SMD component (2) is connected to the circuit carrier (4) by means of a solder connection, wherein the circuit carrier has a plurality of contact elements (5a), wherein in order to dissipate waste heat from the SMD component (2), the circuit carrier (4) has a plurality of micro-vias (7) designed for heat conduction, wherein a number of contact elements (5a) have a substantially hexagonal base (5b), wherein the micro-vias (7) are arranged in a two-dimensional hexagonal packing arrangement with respect to one another in such a way that the substantially hexagonal bases (5b) of the contact elements (5a) are interspersed by a plurality of micro-vias (7) substantially completely, according to the highest area packing density.

In a lighting device adapted to be mounted on a vehicle, a PTC (positive temperature coefficient) thermistor (535), a first fixed resistor (R1), and a first light emitting element (531) are connected in series with a voltage source. A heat conduction suppressor (7) is configured to suppress heat conduction from the first fixed resistor (R1) to the PTC thermistor (535).

In a lighting device adapted to be mounted on a vehicle, a PTC (positive temperature coefficient) thermistor (535), a first fixed resistor (R1), and a first light emitting element (531) are connected in series with a voltage source. A heat conduction suppressor (7) is configured to suppress heat conduction from the first fixed resistor (R1) to the PTC thermistor (535).

A headlight includes light sources, and phase modulation elements that diffract lights incident from the light sources with changeable phase modulation patterns. The lights diffracted by the phase modulation elements are emitted with a low beam light distribution pattern that is a predetermined light distribution pattern based on the phase modulation patterns. A projection region on which zeroth order lights, that are emitted from the phase modulation elements without being diffracted by the phase modulation elements, among the lights incident on the phase modulation elements, are projected is located within a range where a driver's view of a vehicle is obstructed by the vehicle.

A headlight includes light sources, and phase modulation elements that diffract lights incident from the light sources with changeable phase modulation patterns. The lights diffracted by the phase modulation elements are emitted with a low beam light distribution pattern that is a predetermined light distribution pattern based on the phase modulation patterns. A projection region on which zeroth order lights, that are emitted from the phase modulation elements without being diffracted by the phase modulation elements, among the lights incident on the phase modulation elements, are projected is located within a range where a driver's view of a vehicle is obstructed by the vehicle.