IEVref:845-21-093ID:
Language:enStatus: Standard
Term: luminous efficacy for monochromatic radiation of frequency 540 × 10<sup>12</sup> Hz
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Symbol: Kcd
Definition: defining constant of photometry which is equal to 683 lm·W−1

Note 1 to entry: The numerical value of the defining constant has no uncertainty.


Publication date:2020-12
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