Abstract: A lighting device includes a plurality of light source devices and a holding member (first lamp unit and second lamp unit) holding the plurality of light source devices. The light source device has a light source and a storing body for storing the light source. The storing body has a plurality of openings introducing cooling gas and the holding member (first lamp unit and second lamp unit) includes a diverging device guiding the cooling gas to at least one opening among the plurality of openings.

Abstract: A light source device unit includes a light source device including a light source and an outflow port constituting part having a plurality of first outflow ports for making a cooling air flow out, a flow channel constituting part including an inlet port constituting part having a plurality of first inlet ports communicated with the first outflow ports and adapted to introduce the cooling air, and an opening and closing part adapted to selectively open and close the first inlet ports, the first inlet ports are arranged in a periphery of a central axis (a stationary shaft), and the opening and closing part includes a rotary member rotates around the stationary shaft in accordance with a posture of the light source device to thereby selectively open and close the first inlet ports.

Abstract: A lighting device includes a plurality of light source devices and a holding member (first lamp unit and second lamp unit) holding the plurality of light source devices. The light source device has a light source and a storing body for storing the light source. The storing body has a plurality of openings introducing cooling gas and the holding member (first lamp unit and second lamp unit) includes a diverging device guiding the cooling gas to at least one opening among the plurality of openings.

Abstract: A light source device includes a light emitting tube including a light emitting part, a reflector adapted to reflect light emitted from the light emitting tube, a housing body adapted to house the light emitting tube and the reflector, and a plurality of inlet ports adapted to guide a cooling gas to the light emitting tube from respective directions different from each other.

Abstract: Alight source device unit includes a light source device including a light source and an outflow port constituting part having a plurality of first outflow ports for making a cooling air flow out, a flow channel constituting part including an inlet port constituting part having a plurality of first inlet ports communicated with the first outflow ports and adapted to introduce the cooling air, and an opening and closing part adapted to selectively open and close the first inlet ports, the first inlet ports are arranged in a periphery of a central axis (a stationary shaft), and the opening and closing part includes a rotary member rotates around the stationary shaft in accordance with a posture of the light source device to thereby selectively open and close the first inlet ports.