High-pressure sodium discharge lamp

Details High-pressure sodium discharge lamp High-pressure sodium discharge lamp

1982-07-12

1984-12-25

Moore, David K.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313634, 313637, 313113, H01J 6130, H01J 6134, H01J 6112, H01J 512

Patent

active

044906420

ABSTRACT:
To improve the color rendition index R.sub.a, and to lower the color tempture without decreasing the light yield and efficiency of the lamp, the discharge vessel (1, 12, 22) is surrounded by an envelope which comprises a first, or inner envelope element (4, 13, 21) and a second, or outer envelope element (5, 14, 20). The space between the first and second envelope elements, preferably, is evacuated, and the space between the first, inner envelope element and the discharge vessel may include an inert gas, such as nitrogen and/or a noble gas; if the inner envelope element and the discharge vessel are both made of sodium resistant materials, such as Al.sub.2 O.sub.3, the space between the inner envelope element and the discharge vessel may also include sodium of such quantity as to balance the vapor pressure within the discharge vessel and said space outside of the discharge vessel. The lamp can be made double-ended (FIGS. 1, 2) or single-ended (FIG. 3).

REFERENCES:
patent: 2135696 (1938-11-01), Baumhauer et al.
patent: 3225244 (1965-12-01), Van Der Weijer et al.
patent: 3248590 (1966-04-01), Schmidt
patent: 4150317 (1979-04-01), Laska et al.
patent: 4281267 (1981-07-01), Johnson

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