A method to estimate the UV content of illumination sources

Where an illumination source includes flux in the UV region, an estimate of the total flux in the UV can be derived from the fluorescent efficacy of a reference material and the fluorescent emission from the material. A correlate of fluorescent efficiency was derived using a triangular weighting function in the fluorescent emission region and the flux in the fluorescent excitation region. This was found to be constant at different flux intensities, and was used to estimate the UV content of a test illumination. The method gave good results but requires further verification using other materials and illumination intensities.