en

luminous efficacy

1

Terminological databases

Metroloogia terminibaas

ID 1187780 Last modified 26.09.2026
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Domain Standardisation - Metrology
valgusviljakus
Kcd
luminous efficacy
Kcd
  • SI-süsteemi tehniline konstant, mis määrab täpse arvseose inimsilma stimuleeriva kiirgusvõimsuse puhtfüüsikalise karakteristiku ja sellele järgneva fotobioloogilise reaktsiooni vahel
  • technical constant SI that gives an exact numerical relationship between the purely physical characteristics of the radiant power stimulating the human eye and its photobiological response
valgusviljakus
Usage examples
  • Sagedusega 540 × 10¹² Hz monokromaatilise kiirguse valgusviljakus Kcd on konstant, mis määrab kindlaks täpse arvseose vattides mõõdetava inimsilma stimuleeriva kiirgusvõimsuse ja sellele vastava fotobioloogilise reaktsiooni vahel, mis on väljendatud luumenites valgusvoona, tulenevalt standardvaatleja spektraalsest tundlikkusest sagedusel 540 × 10¹² hertsi.
Kcd symbol
Usage examples
  • Kcd = 683 lm∙W−1 on konstandi väärtus, mis eeldatakse olevat muutumatu.
luminous efficacy
Usage examples
  • The luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, is a technical constant that gives an exact numerical relationship between the purely physicalcharacteristics of the radiant power stimulating the human eye (W) and its photobiologicalresponse defined by the luminous flux due to the spectral responsivity of a standardobserver (lm) at a frequency of 540 × 1012 hertz.
Kcd symbol
Usage examples
  • Kcd = 683 lm∙W−1 is is the value of the constant that is assumed to be invariant.

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