Unique chromaticities.
| Uniform Distribution of | alternatively of |
|---|
| 1. Energy with wave-length | | | Quanta with wave-length squared |
| 2. Energy with log wave-length | | | Quanta with wave-length |
| 3. Energy with frequency | | | Quanta with log wave-length |
| 4. Energy with frequency squared | | | Quanta with frequency |
| 5. Energy with frequency cubed | | | Quanta with frequency squared |
| ≎ Blackbody at infinite temperature |
| x | y | z | X/Y=x/y | Z/Y=z/y | Xc/Yc | Zc/Yc | Color Temp.* |
| 1. | 0.3333 | 0.3333 | 0.3333 | 1.0000 | 1.0000 | 1.0200 | 0.8467 | 5640°K |
| 2. | .3071 | .3107 | .3822 | 0.9883 | 1.2301 | 1.0080 | 1.0415+ | 7280° |
| 3. | .2824 | .2861 | .4315+ | .9872 | 1.5084 | 1.0069 | 1.2772 | 10280° |
| 4. | .2959 | .2602 | .4799 | .9986 | 1.8439 | 1.0186 | 1.5613 | 18200° |
| 5. | .2399 | .2341 | .5260 | 1.0246 | 2.2464 | 1.0451 | 1.9020 | ∞ |
*Color temperatures for these non-blackbody chromaticities were estimated by drawing normals to the blackbody locus on a plot of
Zc/Yc against
X/Y, (scale factor 2) and reading reciprocal temperature from a plot of
Zc/Yc against reciprocal temperature for blackbodies. They will, of course, differ from estimates based on other types of “uniform-chromaticity-scale diagram.”
D. B. Judd, J. Opt. Soc. Am.
25, 24 (1935); D. L. MacAdam, J. Opt. Soc. Am
. 27, 294 (1937); F. C. Breckenridge and W. R. Schaub, J. Opt. Soc.
29, 370 (1939); see also W. D. Wright, Proc. Phys. Soc.
53, 93 (1941).
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