Frequencies are temporal periodicities. The spacial counterpart is wavelength. Sunlight comes from electronic transitions in the hot surface plasma. I am quite familiar with the nature of electromagnetic waves. White light contains all the wavelengths (or frequencies, if you wish to refer to them that way). Our color receptor cells have broad spectral response, which allows the brain to distinguish finer colors by ratioing the response from the three basic cells. Ditto on not resorting to nonsense concepts.