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Title: Discharge lamp with reflective jacket

A discharge lamp includes an envelope, a fill which emits light when excited disposed in the envelope, a source of excitation power coupled to the fill to excite the fill and cause the fill to emit light, and a reflector disposed around the envelope and defining an opening, the reflector being configured to reflect some of the light emitted by the fill back into the fill while allowing some light to exit through the opening. The reflector may be made from a material having a similar thermal index of expansion as compared to the envelope and which is closely spaced to the envelope. The envelope material may be quartz and the reflector material may be either silica or alumina. The reflector may be formed as a jacket having a rigid structure which does not adhere to the envelope. The lamp may further include an optical clement spaced from the envelope and configured to reflect an unwanted component of light which exited the envelope back into the envelope through the opening in the reflector. Light which can be beneficially recaptured includes selected wavelength regions, a selected polarization, and selected angular components.
 [1] ;  [2] ;  [1]
  1. (Gaithersburg, MD)
  2. (Damascus, MD)
Publication Date:
OSTI Identifier:
Report Number(s):
US 6291936
DOE Contract Number:
Resource Type:
Research Org:
Fusion Lighting, Inc., Rockville, MD (United States)
Country of Publication:
United States
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