The Importance of Temperature and Relative Humidity in Light Fastness Testing

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Abstract
Differences in temperature during exposure are unlikely to be a direct cause of anomalous results in light fastness testing; differences in effective humidity, however, are of extreme importance and can cause variations of as much as four grades. The effective humidity during daylight exposure in Great Britain by the method specified in B.S. 1006: 1955 has an average value of 20%. Fading lamps should be operated at the same value: the effective humidity in certain lamps is too low and cannot be increased; in others it is too high when running under the makers' recommendations, but in such cases the preferred value can be easily obtained.

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