By W. R. Stevens

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Sensitivity to light falling other than normally on the surface. With all precautions an experienced photometrician will some­ times rely on the instrument to an accuracy better than 1 per cent. In the field the ordinary user will seldom do better than 10 per cent. Such photocells measure the illumination falling on them: obviously this can be used to measure intensity in candelas, from a single source, by applying the inverse square law. Photoelectric cells are also used in measuring light distribution (Fig.

The former is an additive mixture: the latter is subtractive. If we mix lights of different colours the resulting colour is determined by the sum of the constituent wavelengths. If we mix pigments the resulting colour is determined by the light absorbed by the constituents. Yellow paint reflects red, yellow and some green but absorbs blue light. Blue paint reflects blue and green but absorbs yellow and red lights. A mixture of the two will reflect only the common component, namely green. A mixture of red, green and blue pigments will give grey or black because all incident light is absorbed, whereas a mixture of red, green and blue lights will give white.

Ilium. Eng. Soc. ), 26 (1961). W. S. STILES and C. DUNBAR. Ilium. Res. ) Tech. Paper No. O. L. L. HOLLADAY, / . Opt. Soc. Amer. 14, 1 (1927). P. PETHERBRIDGE and R. G. Trans. Ilium. Eng. Soc. Technical Report No. 10. See also P. R. BOYCE, The influence of illumination level on prolonged work per­ formance y Ltg Res and Technology 2, 74 (1970). P. R. BOYCE, Illuminance, difficulty, complexity and visual performance, Ltg Res and Technol. 6, 222 (1974). J. A. LYNES, Lightness, colour and constancy in lighting design, Ltg Res and Technol.

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