A saddle-riding vehicle includes a saddle-riding vehicle body and a headlamp unit supported by the vehicle body. The headlamp unit includes: a lamp housing with a cross-sectional shape perpendicular to a front-back direction getting smaller toward a front side; a projector type lamp housed in the lamp housing and including a first LED light source; and a reflector type lamp housed in the lamp housing and including a second LED light source. The projector type lamp is a low beam lamp, and the reflector type lamp is a high beam lamp.

A vehicle headlight includes a housing and a central area within the housing configured to emit high beam illumination from a high beam light source and configured to emit low beam illumination from a low beam light source. A pair of flow-through vents open to a front side of the housing and open to a rear side of the housing. A pair of outboard areas within the housing include supplementary light sources. The pair of outboard areas are positioned outboard of the pair of flow-through vents of the vehicle headlight.

A vehicle headlight includes a housing and a central area within the housing configured to emit high beam illumination from a high beam light source and configured to emit low beam illumination from a low beam light source. A pair of flow-through vents open to a front side of the housing and open to a rear side of the housing. A pair of outboard areas within the housing include supplementary light sources. The pair of outboard areas are positioned outboard of the pair of flow-through vents of the vehicle headlight.

A lighting device structure includes lighting sources configured to provide lighting illumination, a reflector configured to reflect lighting illumination from the lighting sources as the LED elements, an inner lens mounted to the reflector. The lighting sources, the reflector, the inner lens are housed within a housing, and an outer lens assembled to the housing. The inner lens is mounted to a front end of the reflector and comprises an overlapping portion positions between an outline wall of the reflector and the inner lens. The overlapping portion of the inner lens induces lighting illumination and illuminates the inner lens. The inner lens is mounted to the front end portion of the reflector that does not obstruct to the certain lighting illumination, and comprises a pair of arms which extended closely to the lighting source, such that the inner lens can induce and illuminate itself as the auxiliary light.

A solid-state light source lighting device includes an adjuster configured to adjust an output current to be output through an output port, and a first switch to be electrically connected in parallel with a second LED of a plurality of solid-state light sources, and a controller configured to turn on and off the first switch. The controller is configured to keep the first switch off while the DC voltage (input voltage) received through the input port is higher than a threshold voltage, and keep the first switch on while the input voltage is lower than or equal to the threshold voltage. The threshold voltage is higher than or equal to a voltage necessary to turn on the plurality of solid-state light sources while the first switch is off.

A communication system for a vehicle comprises a mechanism for sensing a change in speed of the vehicle and a control device for sending a signal to a headlight activation circuit to modulate the vehicle's headlights based upon the change in speed. In particular, a headlight of the vehicle is able to be modulated as the vehicle reduces speed and/or is decelerating as it approaches an intersection. Additionally, the headlight of the vehicle is able to be modulated as the vehicle accelerates from a stopped position or reaches a certain traveling speed. The headlight activation circuit is able to modulate the headlight between an on position and an off position or modulate the headlight between a high beam position and a low beam position. Consequently, the vehicle is better seen as it approaches likely congestion areas such as intersections and slowing or stopped traffic and attempts to enter traffic.

A communication system for a vehicle comprises a mechanism for sensing a change in speed of the vehicle and a control device for sending a signal to a headlight activation circuit to modulate the vehicle's headlights based upon the change in speed. In particular, a headlight of the vehicle is able to be modulated as the vehicle reduces speed and/or is decelerating as it approaches an intersection. Additionally, the headlight of the vehicle is able to be modulated as the vehicle accelerates from a stopped position or reaches a certain traveling speed. The headlight activation circuit is able to modulate the headlight between an on position and an off position or modulate the headlight between a high beam position and a low beam position. Consequently, the vehicle is better seen as it approaches likely congestion areas such as intersections and slowing or stopped traffic and attempts to enter traffic.

A headlight structure for ensuring easy structural designing of a light guide member to enhance the degree of the freedom of shape. Reflectors and left and right lenses are disposed respectively on the left and right sides of the center of a vehicle body. Second light sources are attached respectively to the left and right of a light guide member which is roughly W-shaped. Attachment portions and connection portions are hidden by a light-blocking light cover. The left and right reflectors and left and right including shining portions that are visible through the lenses wherein light evenness can be enhanced within an externally visible region. The headlight can be easily enlarged in size and in diameter. The second light sources make it is easy to design the structure of the light guide member for enhancing the degree of the freedom of shape.

A vehicle lamp includes a first semiconductor light emitting device, a second semiconductor light emitting device and a heat sink having a device mounting portion on which the first semiconductor light emitting device and the second semiconductor light emitting device are mounted. The heat sink is formed so as to define a lamp compartment which the first semiconductor light emitting device and the second semiconductor light emitting device face and a space which is defined outside the lamp compartment. The device mounting portion has a first device disposing surface and a second device disposing surface on which the first semiconductor light emitting device and the second semiconductor light emitting device are disposed, respectively, and a recess portion which defines a space which is opened towards the space defined outside the lamp compartment.

A high beam reflector (341) is disposed below a high beam LED light source (46) and reflects light from the high beam LED light source (46) in front of a vehicle. Low beam reflectors (342, 343) are disposed below a low beam LED light source (45) and reflect light from the low beam LED light source (45) in front of the vehicle. The low beam LED light source (45) is located on either side of the high beam LED light source (46) and disposed in front of the high beam LED light source (46). The high beam reflector (341) is longer than the low beam reflectors (342, 343) in the front-rear direction, and the low beam reflectors (342, 343) are positioned before the high beam reflector (341).