Abstract: The works on relative luminous efficiencies, or V(λ), had been studiedby many researchers, and proved to be very useful in both theoretical andpractical fields of vision and colour technology. In the years 1924 and 1951,the spectral sensitvity curves for photopic and scotopic visions were esta-blished by the C. I. E. respectively. But in the 18th session of C. I. E.,which was held in 1975, the chairman of the committee of vision, J. A. S. Kinney had raised the question whether there exist misuses of V(λ) or notin its applications. Together with other disagreements concerning V(λ), thisinquiry suggested us to think of the appropriateness of the application ofC. I. E. V(λ) in China, where the people differed ethnologically from theobservers of C. I. E. V(λ). For this reason, we undertook a serial study onthe relative spectral luminosity among Chinese people, the result we obtainedreads as follows: (1) Both photopic and scotopic relative spectral luminosityof Chinese people are rather coincident with or run very close to those ofC. I. E. and especially that with D. B. Judd's revision. These findings in turnsupport such opinions which suggested that there is likely no significantethnological differnce in this respect. (2) Both photopic and scotopic relati-ve spectral luminous efficiency functions increase with age on the short wa-ve side of the spectrum. (3) Under the conditions of 4 sizes of visual angle,the results show that as the size of visual field increases, V(λ) heightens onthe short wavelength side accordingly. (4) Under the conditions of 4luminosity levels, the V(λ) curves become slender when the luminosity rose.

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