LED end of life optical comparator and methods for determining LED light fixture end of life
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United States of America Patent
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Aug 4, 2020
Grant Date -
Jun 2, 2016
app pub date -
Jun 30, 2014
filing date -
Jun 28, 2013
priority date (Note) -
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Abstract
The present invention provides methods and devices for determining end of life of a light fixture by comparing the light output of a control LED of the fixture with the light output of an illumination LED of the fixture. The control LED is energized for a short period of time for the purpose of measuring its light output. The illumination LED is energized for the duration of time of the light fixture itself. In this way, the amount of degradation of the illumination LED can be determined by comparison with the control LED. If the light output of the illumination LED falls below a threshold level, actions may be take, such as, for example, sounding an alarm.
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