High voltage incandescent lamp with low-pressure Kr/N.sub.2 gas fill
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Jun 28, 1994
filing date -
Jun 30, 1993
priority date (Note) -
Expired
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Abstract
An incandescent lamp which is operable at about 200-275 V is obtainable by enclosing a filling composition consisting of about 80-95% by volume of krypton gas and about 5-20% by volume of nitrogen gas in a glass envelope bearing a tungsten filament and an inner volume of about 0.2-1.2 ml/operating wattage in an amount of about 0.7-0.9 ml/ml of the inner volume. The incandescent lamp exhibits satisfactory luminous characteristics and an extended life expectancy without causing arc discharge even when operated at a voltage of about 200-275 V. Thus a lighting device which comprises such an incandescent lamp as the luminous source and a power source capable of energizing it at a voltage of about 200-275 V is very useful in general and special illumination.
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