High pressure sodium lamp of low power
AssigneePatent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
InventorsWolfram Graser, Dieter Schmidt
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Abstract
The high-pressure sodium discharge lamp of low power described here is chcterized by a very high xenon cold filling pressure of at least 1 bar. The pressure ratio to the sodium operating pressures lies between 10 and 30. Luminous efficacies of approximately 100 lm/W and more can be obtained with a lamp power of 50 to 100 W.
Claims14
High-pressure sodium discharge lamp of low power with a discharge vessel, which contains at least sodium and xenon and is free of mercury, in which p.sub.NaB is the operating filling pressure of sodium and p.sub.XeK is the cold filling pressure of xenon, is characterized in that
- p.sub.NaB =20 to 100 mb,
- p.sub.Xek =1 to 5 bars and,
- p.sub.XeK /p.sub.NaB .gtoreq.10,
- and the lamp power is 100 watts or less.
High-pressure sodium discharge lamp of low power with a discharge vessel, said vessel containing sodium, mercury and xenon, in which p.sub.NaB is the operating pressure of sodium and p.sub.XeK is the cold filling pressure of xenon, which is characterized in that
- p.sub.NaB =20 to 100 mb,
- p.sub.Xek =1 to 5 bars, and
- p.sub.XeK /p.sub.NaB .gtoreq.10,
- And the lamp power is less than or equal to 100 watts;
- the discharge vessel is circular-cylindrical;
- and
- the inner diameter of the discharge vessel is between 2.5 and 5 mm.
Dependencies are inferred from the claim text.