IEC 60050 - International Electrotechnical Vocabulary


IEVref:	845-01-25		ID:
Language:	en		Status: Obsolete

Term:	luminous flux
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Synonym2:
Synonym3:
Symbol:	Φ_v Φ
Definition:	quantity derived from radiant flux Φ_e by evaluating the radiation according to its action upon the CIE standard photometric observer. For photopic vision $Φ_{v} = K_{m} \int_{0}^{\infty} \frac{d Φ_{e} (λ)}{d λ} \cdot V (λ) d λ$ where $\frac{d Φ_{e} (λ)}{d λ}$ is the spectral distribution of the radiant flux and V(λ) is the spectral luminous efficiency unit : lm NOTE – For the values of K_m (photopic vision) and K′_m (scotopic vision), see 845-01-56.
Publication date:	1987
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Internal notes:	2017-06-02: Cleanup - Remove Attached Image 845-01-25en.gif
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Φe Φ v = K m ∫ 0 ∞ d Φ e ( λ ) dλ ⋅V( λ )dλ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabfA6agnaaBaaaleaacaWG2baabeaakiabg2da9iaadUeadaWgaaWcbaGaciyBaaqabaGcdaWdXaqaamaalaaabaGaaeizaiabfA6agnaaBaaaleaaciGGLbaabeaakmaabmaabaGaeq4UdWgacaGLOaGaayzkaaaabaGaaeizaiabeU7aSbaaaSqaaiaaicdaaeaacqGHEisPa0Gaey4kIipakiabgwSixlaadAfadaqadaqaaiabeU7aSbGaayjkaiaawMcaaiaabsgacqaH7oaBaaa@51BD@ d Φ e (λ) dλ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaacmWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaaeizaiabfA6agnaaBaaaleaacaGGLbaabeaakiaacIcacqaH7oaBcaGGPaaabaGaaeizaiabeU7aSbaaaaa@3E87@ Vλ unit : lm K_m (photopic vision) and K′_m (scotopic vision), see 845-01-56.