Abstract—Nowadays, there are many metrics to determine the color rendering provided by a light source. The Color Rendering Index is the most widely metric used to determine the accuracy of a light source, according to eight color samples. However, this metric does not allow a proper measurement for LED lamps. Recently, the Color Quality Scale was defined, extending the color samples selected by previous metrics in order to improve the analysis of LED lamps. However, the results of both metrics for a low correlated color temperature use as reference the Standard Illuminant A, that is to say, the color rendering of an incandescent lamp, which does not represent the real conditions of the natural color rendering. Currently, new metrics appears, such as the TM-30-15, based on 99 color samples and a complex calculation. According to this context, a new metric is proposed, based in the Spectral Power Distribution of daylighting. The daylight spectrum is corrected by the photopic luminosity function, as well as the spectrum of the light source sample. Both corrected spectrums are compared in order to determine the Daylight Spectrum Index. This new metric represents a better definition of the LED lamps for a high correlated color temperature,
Index Terms—Daylight, spectrum, index, color rendering, color temperature, color quality scale.
Ignacio Acosta is with the Instituto Universitario de Arquitectura y Ciencias de la Construcción, Sevilla. 2 Reina Mercedes Ave. Seville, Spain (e-mail: iacosta@us.es).
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Cite: Ignacio Acosta, "Daylight Spectrum Index: Development of a New Metric to Determine the Color Rendering of Light Sources," International Journal of Engineering and Technology vol. 9, no. 6, pp. 442-447, 2017.
