Patent ID: 8350480

Claim:
An electrodeless plasma lamp comprising: a metallic enclosure to form at least part of a resonator; a bulb containing a fill, a volume of the bulb being less than the volume of the metallic enclosure; and a power source to provide power to the resonator and the fill to form a light emitting plasma, wherein the metallic enclosure has at least three regions, a first region, a second region and a third region; the first region having a first height and the third region having a third height; the second region being positioned between the first region and the third region; the second region including an upper opening provided in a metallic upper side of the second region, and a lower opening provided in a metallic lower side of the second region, a first end of the bulb extending above the metallic upper side and the second end of the bulb extending below the metallic lower side; at least the second opening located below a plane in which the first region or the third region is located; and the second region having a second height between the metallic upper side and the metallic lower side that is less than the first height and the third height.