Patent ID: 8573779

Claim:
A lighting device comprising: a first light source section; a second light source section whose etendue is different from that of the first light source section; a second rod integrator for combining light emitted from the first light source section and light emitted from the second light source section, the second rod integrator defining a second-rod-integrator incident surface; and a first rod integrator for guiding onto the second rod integrator the light emitted from the first light source section, the first rod integrator defining a first-rod-integrator exit surface; wherein: the surface area of the second-rod-integrator incident surface is larger than the first-rod-integrator exit surface, a first region on which the light emitted from the first light source section is incident and a second region on which the light emitted from the second light source section is incident do not overlap each other, on the second-rod-integrator incident surface, a converging angle of the light that is emitted from the first light source section and converged on the first-rod-integrator exit surface is substantially equal to a converging angle of the light that is emitted from the second light source section and converged on the second region, and the surface area of the first region and the surface area of the second region are proportional respectively to the etendue of the first light source section and to the etendue of the second light source section.