A priority control circuit for the operation of vehicle lamps. The priority control circuit includes a first circuit and a second circuit. The first circuit includes a first PNP transistor, a first NPN transistor having a gate connected to a collector of the first PNP transistor, and a first output port connected to a collector of the first NPN transistor. When a first lamp turn-on signal for turning on a first lamp is input, the first circuit turns on a second lamp and a third lamp. The second circuit includes a second NPN transistor, a second PNP transistor having a gate connected to a collector of the second NPN transistor, and a second output port connected to a collector of the second PNP transistor. The second circuit controls priorities for the operation of the second lamp and the third lamp.

A priority control circuit for the operation of vehicle lamps. The priority control circuit includes a first circuit and a second circuit. The first circuit includes a first PNP transistor, a first NPN transistor having a gate connected to a collector of the first PNP transistor, and a first output port connected to a collector of the first NPN transistor. When a first lamp turn-on signal for turning on a first lamp is input, the first circuit turns on a second lamp and a third lamp. The second circuit includes a second NPN transistor, a second PNP transistor having a gate connected to a collector of the second NPN transistor, and a second output port connected to a collector of the second PNP transistor. The second circuit controls priorities for the operation of the second lamp and the third lamp.

An aircraft landing light with static function switching for producing at least two beams having different characteristics, in particular different orientations and/or openings, comprises an array of light-emitting diode lighting modules (6) each comprising at least two sets of at least one light source (S1, S2), operable selectively and statically to provide at least one of the lighting functions. Each lighting module (6) comprises a common converging lens (L) for the light sources, the converging lens comprising a light input optical surface (Li) and a light output optical surface (L.sub.2), said light sources being positioned in relation to the light input optical surface.

An aircraft landing light with static function switching for producing at least two beams having different characteristics, in particular different orientations and/or openings, comprises an array of light-emitting diode lighting modules (6) each comprising at least two sets of at least one light source (S1, S2), operable selectively and statically to provide at least one of the lighting functions. Each lighting module (6) comprises a common converging lens (L) for the light sources, the converging lens comprising a light input optical surface (Li) and a light output optical surface (L.sub.2), said light sources being positioned in relation to the light input optical surface.

A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage V.sub.OUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.sub.j.

A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage V.sub.OUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.sub.j.

A vehicle lamp forms an additional high-beam light distribution pattern with light emitted though a projection lens from a plurality of light emitting elements. The plurality of light emitting elements are disposed to be aligned in a transverse direction below a rear focal point of the projection lens and can be lit individually. The vehicle lamp forms an additional light distribution pattern by lighting the plurality of light emitting elements at the same time to form a high-beam light distribution pattern. In addition, the vehicle lamp forms another additional light distribution pattern where a part of the additional light distribution pattern is omitted by selectively lighting a part of the plurality of light emitting elements so as to form an intermediate light distribution pattern.

A vehicle lamp forms an additional high-beam light distribution pattern with light emitted though a projection lens from a plurality of light emitting elements. The plurality of light emitting elements are disposed to be aligned in a transverse direction below a rear focal point of the projection lens and can be lit individually. The vehicle lamp forms an additional light distribution pattern by lighting the plurality of light emitting elements at the same time to form a high-beam light distribution pattern. In addition, the vehicle lamp forms another additional light distribution pattern where a part of the additional light distribution pattern is omitted by selectively lighting a part of the plurality of light emitting elements so as to form an intermediate light distribution pattern.

A vehicle lamp includes a projection lens and a plurality of light emitting elements arranged in parallel in a required direction behind the projection lens, and is configured to irradiate light emitted from each of the light emitting elements toward a front side through the projection lens. A plurality of diffusing lens elements that diffuse the light emitted from each of the light emitting elements in the required direction are provided on a front surface and/or a rear surface of the projection lens in a stripe shape to extend in a direction orthogonal to the required direction when viewed from the front side of the lamp.

A vehicular headlight includes: a first light emitting element (55) that emits a first light (L1); a second light emitting element (63) that emits a second light (L2); a shade (43); and a projection lens (20), in which an upper surface of the shade (43) has a first reflection surface (43a) that reflects another part of the first light (L1) to the projection lens (20) side, and a lower surface of the shade has a second reflection surface (43b) that reflects another part of the second light (L2) to the projection lens (20) side, and a front end (43c) of the shade (43) has a step (43cs) in an up and down direction corresponding to a shape of a cut line of a light distribution pattern of the low beam.