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Lighting device and lighting method

  • US 10,030,824 B2
  • Filed: 05/08/2008
  • Issued: 07/24/2018
  • Est. Priority Date: 05/08/2007
  • Status: Active Grant
First Claim
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1. A lighting device comprising:

  • a first group of solid state light emitters;

    a second group of solid state light emitters; and

    a first luminescent material;

    wherein;

    if electricity is supplied to said first group of solid state light emitters, said first group of solid state light emitters emit light having a peak wavelength in the near ultraviolet range;

    if electricity is supplied to said second group of solid state light emitters, said second group of solid state light emitters emit light having a peak wavelength in the range of from about 600 nm to about 630 nm;

    said first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 555 nm to about 585 nm;

    if electricity is supplied to said first group of solid state light emitters, a mixture of (1) light emitted from said lighting device which was emitted by said first group of solid state light emitters and (2) light emitted from said lighting device which was emitted by said first luminescent material would, in the absence of any additional light, have a mixed illumination having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38;

    at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a first string;

    at least one of the first group of solid state light emitters and at least one of the second solid state light emitters on a second string;

    the first string electrically parallel to the second string;

    a first ratio differs from a second ratio;

    said first ratio equal to (1) a number of solid state light emitters in said second group of solid state light emitters and in said first string, divided by (2) a number of solid state light emitters in said first group of solid state light emitters and in said first string;

    said second ratio equal to (3) a number of solid state light emitters in said second group of solid state light emitters and in said second string, divided by (4) a number of solid state light emitters in said first group of solid state light emitters and in said second string.

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