Human Centered Lighting
Quality lighting not only addresses traditional goals such as visual comfort, task performance, safety and aesthetics, but has also been observed to promote positive effects on human psychology and physiology. One of the driving forces behind many of the latest innovations in the lighting industry is human-centered lighting (HCL). HCL goes beyond basic visual needs to support people's physiological and psychological health. Humans use environmental cues from light to synchronize the body's internal biological clock with the earth's 24-hour light-dark rotation cycle. The internal biological clock located in the suprachiasmatic nucleus (SCN) of the hypothalamus regulates human circadian rhythms. Since a large part of modern life is spent indoors, there will be differences between the biological rhythm and the external day/night rhythm due to the absence of static lighting and circadian drift. Disruption of the biological rhythm can affect the normal release of hormones such as melatonin and cortisol. Impaired hormone production can interfere with cell metabolism and proliferation, inhibit the expression of clock genes associated with cancer and diabetes risk, and impair cognitive, psychological, and social performance.
Human-centered lighting explores a complete dynamic lighting scheme to strengthen the body's circadian rhythm and the natural cycle of biological functions. While conventional lighting systems provide static white light throughout the day, human-oriented lighting systems bring the dynamics of natural daylight to the building. The spectral composition and intensity of the interior lighting are intended to reflect the characteristics of the exterior daylight. The essence of human-centered lighting is the dynamic control of bioactive blue dosage. Exposure to blue light at higher wavelengths of light suppresses melatonin production and increases the secretion of other hormones such as cortisol, dopamine, and serotonin.
Human-centered lighting provides healthy bioactive blue dosages at the right biological time with adjustable white light technology. Dynamic white systems use advanced LED drivers and multi-channel light engines to allow flexible adjustment of the spectral composition and intensity of the light. These intelligently adaptable and/or user programmable systems offer the freedom to evoke specific emotional, physiological and psychological responses for improved atmosphere, performance, motivation, concentration and quality of life in homes, offices, schools, retail spaces and healthcare settings. HCL systems will proliferate in the coming years. This requires the lighting industry to stay at the forefront of tunable white lighting technology so it can keep up with the rapid pace of adoption of HCL.