With conventional artificial light, we expose ourselves to inappropriate light, having the same type of light at all times. This can lead to a disruption of our circadian rhythms, which can have a negative impact on our sleep-wake cycles, meaning difficulty sleeping, feeling energised, and dealing with stress.
In order to not alter these cycles, it is recommended to have indoor spaces where electric lighting reproduces or imitates natural light, taking into special account light non-visual parameters, such as light wavelength and color. This is called Circadian Lighting: an artificial lighting system based on accurately reproducing sunlight in any given moment of the day.
Only "on" and "off" was yesterday. With Human Centric Lighting, the user experiences the right light at the right time at different times of the day and year. People notice the effect consciously or experience it unconsciously.