Very high efficacy electrodeless high intensity discharge lamps

Details Very high efficacy electrodeless high intensity discharge lamps Very high efficacy electrodeless high intensity discharge lamps

1985-10-03

1987-11-10

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313639, 313642, 313161, H01J 6120, H01J 6130

Patent

active

047059877

ABSTRACT:
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.

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patent: 4591759 (1986-05-01), Chalek et al.
"Complex Halide Vapors in Metal Halide Type Hid Lamps", Journal of IES, p. 209, Jul. 1977.
"Electrodeless Hid Lamp Study", General Electric Co., Corporate Research and Development, (Lawrence Berkeley Lab.), Anderson et al., Jan. 1985.

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