Abstract
In Chapter 4 we saw that fluorescent materials as employed in fluorescent lamps are capable of emitting light of widely divergent colours. Calcium silicate, for instance, when activated with lead and manganese, gives an orange; zinc silicate, activated with manganese (willemite) a green, and calcium tungstate a blue-violet emission. Some of the colours are very vivid because the spectral emission bands of many of these materials are rather
When yellow and blue paints are mixed, the resultant colour is green; the same result is obtained when yellow ink is printed on top of blue ink.
Mixing of yellow and blue paints, ϱ = reflection factor. Full line = curve for yellow paint. Broken line = curve for blue paint.
Dot-dashed line = curve for mixture. λ = wavelength in nm. The colour impressions evoked by the various wavelengths are indicated at the top of the diagram.
narrow. If the light from a fluorescent lamp is required to cover the whole of the visible spectrum, often two or more different materials must be mixed.
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Notes
P. J. Bouma and A. A. Kruithof, Philips Techn. Rev. 9, 2 (1947).
A. A. Kruithof and J. L. Ouweltjes, Philips Techn. Rev. 18, 249 (1957).
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© 1971 N.V. Philips’ Gloeilampenfabrieken, Eindhoven
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Kruithof, A.A., Ouweltjes, J.L. (1971). Colour and colour rendering. In: Elenbaas, W. (eds) Fluorescent Lamps. Philips Technical Library. Palgrave, London. https://doi.org/10.1007/978-1-349-00361-7_6
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DOI: https://doi.org/10.1007/978-1-349-00361-7_6
Publisher Name: Palgrave, London
Print ISBN: 978-1-349-00363-1
Online ISBN: 978-1-349-00361-7
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