Patent ID: 7791280

Claim:
A plasma lamp comprising: a waveguide body including a recess; a power source coupled to the waveguide body to provide power to the waveguide body at a first frequency; the waveguide body having 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 second height; the second region positioned between the first region and the third region; the second region including an opening that extends below a plane in which a first surface of the first or third region is located, the opening at least partially to receive a bulb; wherein the second region has a thickness between the opening and the recess that is less than the first height and the second height; and the waveguide body shaped to provide an electric field intensity in the second region that is higher than an electric field intensity in the first region and the third region when the power is provided by a feed positioned in the first region.