| 摘要 |
An illumination source is composed of a white LED of a first light source color and an orange LED of a second light source color, so that light is emitted in a color created as a result of mixing the first and second light source colors. The first and second light source colors are represented on the 1931 CIE chromaticity diagram by a first point P 1 and a second point P 2 , respectively. The first point P 1 is substantially on the Planckian Locus PL. The second point P 2 is at such a position that a line segment L 1 connecting the first and second points P 1 and P 2 is substantially in parallel with a tangent line L 3 to the Planckian Locus PL. The tangent line L 3 has a point of tangency on a line L 2 that is normal to the Planckian Locus PL and passes through the first point P 1.
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