This standard establishes requirements for light sources appropriate for use in the sensitometric exposure of photographic materials, both black and white and colour. The spectral characteristics of the exposure radiant energy correspond closely to the spectral energy distribution of average daylight modified by the spectral transmission of a typical photographic lens (see Table III), excluding infrared rays.
UNI 7237-1973 history
1973UNI 7237-1973 photo. Light source for photosensitive exposure. Simulation of sunlight spectral distribution