In order to describe a color of a not self-luminous source it is important to have detailed knowledge of the illuminant used. The International Commission on Illumination CIE (Commission Internationale de l'Éclairage) have defined a number of spectral power distributions, referred to as CIE standard illuminants, to provide reference spectra for colorimetric issues. The illuminants are denoted by a letter or a letter-number combination. Their spectral power distributions (SPD) are normalized to a value of 100 at a wavelength of 560 nm in following figures.
A convenient solution that provides the standard types of illumination and that is large enough to illuminate a whole table top scene is offered by the lightSTUDIO.