Very high efficacy electrodeless high intensity discharge lamps

Patent · Tue Nov 10 00:00:00 EST 1987

OSTI ID:5657770

Johnson, Peter D.

An electrodeless arc lamp comprises an outer jacket hermetically sealing and thermally protecting an arc tube inside which has an upwardly convex bottom center section. The absence of chemically reactive electrode material makes it possible to use metal halides other than iodides. The tube contains chlorides, bromides or a mixture thereof of scandium and sodium in a nearly equimolar relationship in addition to mercury and an inert gas. Good color balance can be obtained at reduced reservoir temperature and with less power loss. Reduction in wall temperature makes it possible to attain longer lamp life.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00098
• Assignee: The United States of America as represented by the United States (Washington, DC)
• Patent Number(s): 4,705,987
• Application Number: 06/783,730
• OSTI ID: 5657770
• Resource Relation: Patent File Date: 1985 Oct 03
• Country of Publication: United States
• Language: English

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