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10.9 Limitations in Use of PHT Colour Correction Factors

Caveat: Colour correction factors above 2 should be considered as less accurate and factors above 4 only as an indication of the order of the correction, as they clearly depend on the integration and interpolation method used. In these cases it is recommended to establish the colour correction factor independently by using the bandpass transmission (Section 14.24) and a model for the spectral energy distribution of the source.

ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc