This is a spectral dataset of natural light collected in the Netherlands. The data supplement contains the rural and city cubic irradiance spectra with associated wavelength spacing. We measured natural light fields for sunny weather in the shade and light for 24 rural and urban scenes across multiple days (in total 48 cubic measurements). We also measured natural light fields from dawn till dusk on a sunny day (in total 165 cubic measurements) and a cloudy day (in total 124 cubic measurements). This spectral light-field dataset provides comprehensive illumination statistics useful for understanding biological vision. The data reveal how perceptually meaningful aspects of the light, such as the direction, colour and diffuseness of the main light components, vary over space and time in ecologically valid conditions.