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Methods, Apparatus and Articles of Manufacture to Calibrate Lighting Units

  • US 20150230315A1
  • Filed: 04/27/2015
  • Published: 08/13/2015
  • Est. Priority Date: 09/24/2008
  • Status: Active Grant
First Claim
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1. A method for calibrating a color LED light unit comprising at least first-, second-, and third-color LEDs, comprising:

  • a) defining a target color on a color map to calibrate that requires a contribution from at least the first- and second-color LEDs;

    b) selecting first and second initial calibration coefficients associated with the first- and second-color contributing LEDs that contribute to the target color;

    c) storing the initial or updated first and second calibration coefficients in a non-volatile memory of the light unit;

    d) controlling the light unit to simultaneously drive the first and second LEDs to attempt to emit the target color, producing an attempted color, utilizing the calibration coefficients;

    e) measuring the attempted color to determine if it matches the target color within a predefined tolerance;

    f) if the attempted color matches the target color, then terminating the method;

    g) if the attempted color does not match the target color, then performing the following;

    h) selecting a color component corresponding to the first-color LED;

    i) updating the first calibration coefficient associated with the selected color component;

    j) performing (c)-(f) immediately again;

    k) if the attempted color does not match the target color, then performing the following;

    l) selecting a color component corresponding to the second-color LED;

    m) updating the second calibration coefficient associated with the selected color component;

    n) performing (c)-(f) again.

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