A plasma lamp including a waveguide body including at least one dielectric material with a dielectric constant greater than approximately 2. The body is coupled to a microwave source which causes the body to resonate in at least one resonant mode. At least one lamp chamber integrated with the body contains...http://www.google.com.au/patents/US7372209?utm_source=gb-gplus-sharePatent US7372209 - Microwave energized plasma lamp with dielectric waveguide
