AbstractA number of different ways for the assessment of the ultraviolet emission of light sources are surveyed. A method of assessment using a set of three hypothetical near‐white fluorescent samples is described in which the sum of the excitation curves for the fluorescent samples has been made to resemble the spectral emission curve of Standard IlluminantD65when plotted on a quantum scale of ordinates. The chromaticity shift of each fluorescent sample produced when the reference illuminantD65is replaced by the test illuminant is used to produce a special fluorescent‐rendering index in a manner analogous to that used for colour‐rendering indices. The index is scaled in such a way that values greater than 100 indicate an excess of ultraviolet for the test lamp compared with the reference illuminant. Special fluorescent‐rendering indices are given for a number of real lamps, and they accord reasonably well with the known performance of th
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