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Method and device for efficiently generating white light with good rendition of illuminated objects

  • US 4,176,294 A
  • Filed: 12/03/1976
  • Issued: 11/27/1979
  • Est. Priority Date: 10/03/1975
  • Status: Expired due to Term
First Claim
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1. A device which efficiently generates white light and illuminates objects with a color appearance which is reasonably representative of their color appearance under natural light, said device comprising:

  • (a) a three-component, light-generating medium forming an operative part of said device;

    (b) means for connecting said device to a source of predetermined electric potential to energize said medium to a visible-light-generating condition;

    (c) a first component of said medium when energized exhibiting a green to yellow-green emission located substantially in the wavelength range of from 515 nm to 570 nm;

    (d) a second component of said medium when energized exhibiting an orange to red emission located substantially in the wavelength range of from 588 nm to 630 nm;

    (e) the third component of said medium when energized enhibiting a purplish-blue to greenish-blue emission located substantially in the wavelength range of from 430 nm to 485 nm; and

    (f) the relative proportions of said components of said light-producing medium being such that when their emissions are blended, there is produced white light of predetermined ICI coordinates.

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