Reflector lamp

Claim 1

A lamp comprising a substantially concave reflector having faceted surfaces longitudinally extending along a major portion of a front section of said reflector, said faceted surfaces comprising subsections each of which is rotated about an axis predeterminedly located relative to the longitudinal axis of said lamp, said front section being substantially defined by a surface of revolution of a first parabolic curve whose focal point is relatively close to the vertex thereof with the surface terminating essentially at the latus rectum thereof, an intermediate section of substantially spherical configuration having a center substantially at the focal point of said front section and a diameter essentially the length of said latus rectum, a rear section substantially defined by a surface of revolution of a second parabolic curve which terminates at the circular junction with said spherical intermediate section, having a focal point located substantially farther from the vertex of said second parabolic curve 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 so that substantially all light rays from said light source which are reflected by said spherical intermediate section are re-reflected by said front section, wherein said light rays reflected by said facets include components thereof which are circumferential about the lamp axis and thereby provide a beam pattern which is substantially circumferentially uniform about said lamp axis.