Light and light sensor

  • US 10,182,480 B2
  • Filed: 03/16/2017
  • Issued: 01/15/2019
  • Est. Priority Date: 10/24/2008
  • Status: Active Grant
First Claim
Patent Images

1. A method, comprising:

  • determining, using a photodetector, a first brightness level of light during operation of an LED-based lighting device during a first time period,outputting, from the photodetector, a first signal corresponding to the determined first brightness level;

    determining, based on the first signal, an amount of light emitted by one or more light emitting diodes (LEDs) of the LED-based lighting device during the first time period, and an amount of light emitted by one or more ambient light sources other than the one more LEDs during the first time period;

    determining, using the photodetector, a second brightness level of light during operation of the LED-based lighting device during a second time period;

    outputting, from the photodetector, a second signal corresponding to the determined second brightness level;

    determining, based on the second signal, an amount of light emitted by the one or more LEDs during the second time period, and an amount of light emitted by the one or more ambient light sources during the second time period;

    determining that the amount of light emitted by the one or more ambient light sources during the first time period is similar to the amount of light emitted by the one or more ambient light sources during the second time period; and

    estimating, using a controller, an efficiency of the one or more LEDs based on the determination that the amount of light emitted by the one or more ambient light sources during the first time period is similar to the amount of light emitted by the one or more ambient light sources during the second time period.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×