Light and light sensor

  • US 10,560,992 B2
  • Filed: 01/10/2019
  • Issued: 02/11/2020
  • Est. Priority Date: 10/24/2008
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an LED-based lighting device comprising;

    a housing,a plurality of light emitting diodes (LEDs) disposed within the housing, anda connector coupled to an end of the housing, wherein the connector is configured to engage with a light socket;

    a sensor configured to;

    determine a brightness level of light during operation of the LED-based lighting device, andoutput a signal corresponding to the determined brightness level; and

    a controller configured to;

    estimate an efficiency of the plurality of LEDs based on the signal,determine that the efficiency of the plurality of LEDs is less than a threshold efficiency, andresponsive to determining that the efficiency of the plurality of LEDs is less than the threshold efficiency, operating at least some of the plurality of LEDs to indicate that the efficiency of the plurality LEDs is less than the threshold efficiency,wherein operating said at least some of the plurality of LEDS to indicate that the efficiency of the plurality of LEDs is less than the threshold efficiency comprises illuminating a first LED according to a first color and a second LED according to a second color, the first LED being adjacent to the second LED, and the first color being different than the second color.

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