Determining remaining operating life of fluorescent lamp
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Sep 26, 2000
filing date -
Sep 27, 1999
priority date (Note) -
Expired
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Abstract
A method for determining the remaining operating life of a fluorescent lamp comprising cathodes, when the fluorescent lamp is a part of a fluorescent lamp circuit, which in addition to the fluorescent lamp includes a ballast, for example a capacitor and an inductance. In accordance with the method the remaining operating life of the fluorescent lamp is deduced from a phase difference of a voltage applied over a cathode in relation to another current or voltage phase in the fluorescent lamp circuit.
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