Method of dimensioning and operating a low pressure discharge lamp
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United States of America Patent
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Mar 12, 1996
Grant Date -
N/A
app pub date -
Jun 10, 1993
filing date -
Jan 20, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of dimensioning and operating by A.C. or D.C. at a predetermined external heater power a low pressure discharge lamp, particularly a fluorescent lamp having two electrodes between which the discharge is formed, at least one of the electrodes being alkaline earth oxide coated and adapted to form a permanently heated cathode, particularly for use in video matrix board, and external heater current is used which is approximately 1.5 to 5 times higher than the discharge current, the heater volt is approximately 33.33% to 80% lower than that of a conventionally operated cathode or electrode, respectively, and the wattage of the heater circuit is maintained. By this accuracy of optimum cathode temperature control is improved, enhanced lamp life and reduced discoloration are obtained and the formation of hot spots avoided.
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