HIGH-PRESSURE SODIUM VAPOUR DISCHARGE LAMP WITH MERCURY AND XENON
The invention relates to a high-pressure sodium vapour discharge lamp provided with a discharge tube containing mercury and xenon as well as sodium. The sodium vapour pressure - in the operating condition of the lamp is within a given range. In accordance with the invention a xenon filling pressure...
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| Format: | Patent |
| Sprache: | eng ; fre |
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| Zusammenfassung: | The invention relates to a high-pressure sodium vapour discharge lamp provided with a discharge tube containing mercury and xenon as well as sodium. The sodium vapour pressure - in the operating condition of the lamp is within a given range. In accordance with the invention a xenon filling pressure is used which is between 50 and 1000 torr. As a result a lamp can be obtained which haa high luminous efficacy in the operating condition. |
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