Color and Spectral Analysis of Daylight in Southern Europe
Abstract
We have analyzed the colorimetric and spectral characteristics of 2600 daylight spectra (global spectral irradiances on a horizontal surface) measured for all sky states during a 2-year period at Granada, Spain. We describe in detail the chromaticity coordinates, correlated color temperatures (CCT), luminous efficacies, and relative UV and IR contents of Granada daylight. The chromaticity coordinates of Granada daylight lie far above the CIE locus at high CCTs (greater than 9000 K), and a CCT of 5700 K best typifies this daylight. Our principal components analysis shows that Granada daylight spectra can be adequately represented by using six dimensional linear models in the visible, whereas seven-dimensional models are required if we include the UV or near-IR. Yet on average only three-dimensional models are needed to reconstruct spectra that are colorimetrically indistinguishable from the original spectra.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2001
- Accession Number
- ADA525941
Entities
People
- Javier Hernandez-andres
- Javier Romero
- Juan L. Nieves
- Raymond L. Lee Jr.