For luminaire to achieve full effect it has to be able to supplant daylight not just in illumination of a given space, but in all of its biological purposes as well.
Dynamic lighting systems are especially effective in delivering the desired effects. The better the system is at replicating the various aspects and effects of natural light, in stimulating the circadian ganglion cells, the higher it should rank in the emotion aspect.
In spaces with access to natural light the artificial system should play a secondary role: helping to illuminate room in the mornings and evenings or improve lighting conditions in overcast weather or short winter days.
To prevent sudden changes in illumination levels the switch between natural and artificial light should be gradual, giving the eye enough time to adjust to the new conditions. Such use of daylight is also energy efficient.