Patent ID: 6696788
Filing Date: 2004-02-24
Classification: H01J

Abstract:
An electric discharge lamp comprising:an envelope having a first wall of a first wall material defining an enclosed first chamber including a first fill material; the first chamber being substantially surround by and sealed to a second wall of a second wall material defining an enclosed second chamber intermediate the first wall and the second wall, the second chamber including a second fill material; the first fill material being excitable to light emission of a first spectrum on the application of electric power, and the first wall material being light transmissive of at least a portion of the first spectrum; the second fill material having a gaseous state at least during lamp operation, and being excitable to light emission of a second spectrum on the application of energy from the first envelope, and being light transmissive of at least a portion of the first spectrum under operating conditions; and the second wall material being light transmissive of at least a portion of the first spectrum and of the second spectrum.