Discussion
Consider the following statements about the Planckian locus.
1. It traces the chromaticities of blackbody radiators.
2. Sources near it appear white rather than strongly coloured.
3. Every practical light source lies exactly upon it.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the locus is the path traced by blackbody chromaticities as the temperature varies, and sources near it appear acceptably white. Statement 3 is false and is why correlated colour temperature exists at all - most practical sources lie a little off the locus, and how far off must be reported separately.
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