Illuminating system

An illuminating system comprising:

• a light-emitting lamp;
• a reflecting optical member provided with a reflecting face surrounding a space around said lamp and further provided at one end with a light-emitting aperture for emitting the light of said lamp through said reflecting face to the exterior of the reflecting optical member and at the other end with another aperture for passing a part of said lamp, said reflecting optical member having an optical axis passing through said light-emitting aperture and said another aperture, and the diameter of said light-emitting aperture being larger than the diameter of said another aperture;
• a case member for accommodating said lamp and said reflecting optical member for separating the interior of said case member from the exterior thereof, provided with at least an intake hole and an exhaust hole for communicating the exterior with the interior of said case member, said intake hole being provided near said light-emitting aperture and said exhaust hole being provided at a position facing said another aperture;
• air guide means provided inside said case member for connecting said intake hole with an air flow path passing through said light-emitting aperture and said another aperture, said air guide means having a tubular member disposed in a radial direction relative to said optical axis between said intake hole and the periphery of said light-emitting aperture;
• and
• an air fan provided at said exhaust hole for generating an air flow from said intake hole to said exhaust hole through said tubular member and said air flow path.