Patent ID: 8672520

Claim:
A lamp with an AC lamp burner, the lamp comprising: two electrodes spaced apart from one another; a device configured to apply voltage with alternating polarity to the electrodes, wherein a first luminous centroid is associated with a first of said alternating polarities and a second luminous centroid different from said first luminous centroid is associated with a second of said alternating polarities; and a reflector comprising: a first hemi-ellipsoid section of a first ellipsoid, the first ellipsoid having a first focus and a second focus, the first focus of the first ellipsoid being located at the focus of the first hemi-ellipsoid section; a second hemi-ellipsoid section of a second ellipsoid, the second ellipsoid having a first focus and a second focus, the first focus of the second ellipsoid being located at the focus of the second hemi-ellipsoid section, wherein the first foci of the two ellipsoids are located at different points respectively corresponding to the first and second luminous centroids; and wherein the second foci of the two ellipsoids coincide with one another.