Method for pre-heating a gas-discharge lamp
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United States of America Patent
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Jun 13, 1995
Grant Date -
N/A
app pub date -
Dec 22, 1993
filing date -
Dec 22, 1993
priority date (Note) -
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Abstract
Two methods are disclosed for providing a warm-up or pre-heat period for a gas-discharge lighting system, such as a fluorescent light. One method provides current to the lamp for a predetermined period of time to heat the filaments therein without significant ionization of the lamp. The second method provides current to the lamp to heat the filaments without significant ionization of the lamp until the voltage across the filament reaches a predetermined voltage. After the lamp is pre-heated, the current is increased to ionize the lamp.
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