How does light influence our circadian clock?

For many years, the daily life cycle of human beings has been marked by the sun cycle. For this reason and even though currently most of our activities are carried out indoors, our active time passes when is day light and we sleep when it is night. The colour temperature and the intensity of sunlight is changing during the day. Warm color temperatures are suitable for relaxing moment and the cold ones for greatest activity moments. For this reason, it is important to make a good use of the light, regulating it to get an appropriate CCT according to the activity or time of the day, avoiding alterations in our biological rhythms. A consequence caused by the misuse of lighting would be to be exposured to cold light for more than 90 minutes, which the body would understand it as if it was daytime, stopping the release of melatonin (sleep hormone), and causing problems such as insomnia.