LED end of life optical comparator and methods for determining LED light fixture end of life
US10732030B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2014 |
| Grant date | Aug 4, 2020 |
| Priority date | — |
| Expiry date | Jun 30, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0623
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.