Spectral shift control for dimmable AC LED lighting
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United States of America Patent
Stats
-
Sep 26, 2017
Grant Date -
Dec 29, 2016
app pub date -
Jun 27, 2016
filing date -
Aug 14, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus and associated methods involve operation of an LED light engine in which a relative intensities of selected wavelengths shift as a function of electrical excitation. In an illustrative example, current may be selectively and automatically diverted substantially away from at least one of a number of LEDs arranged in a series circuit until the current or its associated periodic excitation voltage reaches a predetermined threshold level. The diversion current may be smoothly reduced in transition as the excitation current or voltage rises substantially above the predetermined threshold level. A color temperature of the light output may be substantially changed as a predetermined function of the excitation voltage. For example, some embodiments may substantially increase or decrease a color temperature output by a solid state light engine in response to dimming the AC voltage excitation (e.g., by phase-cutting or amplitude modulation).
First Claim
Other Claims data not available
Family
International Classification(s)
- 2016 Application Filing Year
- H05B Class
- 3665 Applications Filed
- 2767 Patents Issued To-Date
- 75.50 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- H05B Class
- 22.53 % this patent is cited more than
- 8 Age
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