This work provides measured spectral data and APE values for a sunny inland climate.

There is a spectrum characterization under three tracking options using APE as indicator.

Mean APE values are below the corresponding to the AM1.5 standard solar spectrum.

There is a prevailing red-rich spectrum in Jaén, which is suitable for CIGS and c-Si.

Spectral gains with 2-axis tracking are higher than a fixed arrangement.