Why use high colour temperatures (CCT) for working areas?
Higher colour temperature (CCT>5000k) light is rich in blue (short wavelengths) spectrum light in a similar proportion to daylight. The shorter wavelengths are much more effective at suppressing the melatonin sleep hormone in humans. The result is that alertness is increased and the body’s natural day/night cycle is reinforced. For this reason light that is rich in blue is said to have a high Circadian factor. Research (Berman) suggests that visual acuity can also increase with high CCT light, leading to lower visual stress and increased task performance.
