Light is the most important time giver of the human’s inner clock. The body’s hormonal reaction to wavelengths and intensities of light is what regulates our inner clock. Melatonin (sleep hormone) is one hormone responsible for our inner clock. This is where jetlite comes into play. jetlite’s lighting solution not only guides the individual inner clock to adapt to a new time zone more effectively by supporting the melatonin level through cool- and warm-colored light, but it also tailors these effects to the individual chronotypes (inner clock) of passengers, as well as cabin interior, crew operation, and flight data creating customized scenarios.