High-pressure sodium vapor lamp
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Feb 27, 1989
filing date -
Mar 25, 1988
priority date (Note) -
Expired
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Abstract
A high-pressure sodium vapor lamp with elevated color temperature, high light yield and improved color rendering properties for general illumination purposes uses sodium or sodium amalgam with mole fractions x.sub.Na >0.9 as the arc media. The lamp power supply supplies pulses with a duty cycle .GAMMA.of 0.01>.GAMMA.>0.1 with alternating polarity, or with mole fractions x.sub.Na >0.95 even at uniform polarity, respectively.
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