US Patent 7919923 Plasma lamp with dielectric waveguide

A plasma lamp and a method of generating light are provided. The plasma lamp may include a lamp body having a dielectric constant greater than about 2 and a power source. The power source is coupled to the lamp body by a feed to provide power to the lamp body. A bulb containing a fill having a first portion and a second portion is provided. The bulb is positioned so that the first portion of the fill is located within the lamp body and the second portion of the fill is located outside of the lamp body. In use, the fill receives at least a portion of the power from the lamp body to form a light-emitting plasma. The volume of the bulb is less than the volume of the lamp body.