Reflector lamp

Claim 1

A lamp comprising a concave reflector having a front section substantially defined by the surface of revolution of a first parabolic curve whose focal point is relatively close to its vertex with the surface terminating essentially at its latus rectum, an intermediate section of substantially spherical configuration having its center substantially at the focal point of said front section and a diameter essentially equal to the length of said latus rectum, a rear section substantially defined by a surface of revolution of a second parabolic curve whose focal point is substantially farther from its vertex than said first parabolic curve with said two focal points being substantially coincident, and a finite light source positioned substantially at said substantially coincident focal points wherein said rear section terminates at the circular junction with said spherical intermediate section so that substantially all light rays from said light source which are reflected by said spherical intermediate section are re-reflected by said parabolic front section.