A survey of 1,000 adults showed that 77% of respondents believed that lighting in the workplace would affect their productivity, 33% said that access to natural light is important, and 32% said they would be happy to help Work under artificial lighting to increase productivity. The survey also found that at home, 31% of respondents believe that lighting is very important when creating a relaxed and quiet atmosphere before going to bed, while 38% believe that morning lighting in the bedroom can help them be full of energy.
In fact, Europe's emphasis on human lighting is far beyond our imagination. The European Lighting Association believes that lighting systems, better light quality, people-oriented and sustainable development are the driving forces for the growth of the European lighting market. Human-caused lighting has been used in commercial and home lighting fields such as offices, schools, restaurants, etc., and greater progress has been made in the healthcare environment. For example, specially designed LED lighting can help reduce medications for mentally ill patients. Dependence, improve dementia care, etc.
emphasizes high light quality and spectrum close to natural light, and integrates humanized intelligent control technology, and human-factor lighting that meets the visual needs of human-factor engineering is becoming the future trend. So, as the most critical item in human lighting, how does lighting affect our sleep? This has a lot to do with our human body’s perception of light color.
First, the non-imaging response of light passing through the retina is affected by the intrinsic melanopsin (Melanopsin), external rod cells (Rods) and cone cells (Cones, red retinal ganglion cells) (intrinsically photosensitive retinal ganglion cells, ipRGCs). , Green and blue) After adjustment, it is converted into a signal and transmitted to the brain.
When the brain receives the signal, the five photoreceptor cells are sensitive to different frequency bands of light according to their respective photosensitive pigments (R rod protein; SC cone protein; MC cone protein; LC cone protein; M melanopsin). Weighted calculation, and obtain the illuminance value to quantify the effect of light on biological rhythms.
Melatonin, which we are all familiar with, is also known as the sleep hormone. It controls the operation of the human body’s biological clock. It secretes less during the day and keeps the human body awake. If it secretes more at night, it makes people feel tired and sleepy. Melanopsin is responsible for the adjustment of non-visual functions, such as the biological clock and the release of Melatonin. Therefore, the intensity of light and color temperature affect people's circadian rhythm, hormone secretion and other external behaviors. This is the biological principle that phototherapy can effectively mediate depression, sleep disorders and other phenomena.
So, how to quantify these photosensitive proteins so that we can detect them? In fact, the five photosensitive pigments mentioned above all have corresponding illuminance parameters. By detecting the illuminance value, we can quantify the impact of lighting on the physiological functions of the human body. One of the most important points is the impact on sleep.
1. Melanopic Lux: A light measurement that quantifies the degree of stimulation of a light source in response to Melanopicin (Melanopsin) light. The higher the value, the less the secretion of melatonin, and the less likely it is to feel tired.
2, Melatonin Daylight Lux (MEL Daylight Lux): This parameter simulates CIE D65 daylight to calculate the indoor lighting environment "the most suitable for sunlight". If a space designer wants to create a full-spectrum atmosphere of daylight, it is recommended to refer to this value.
3, SML cone & R rod illuminance (Cyanopic, Chloropic, Erythropic, Rhodopic lux): This parameter analyzes the impact on organisms through the quantification of environmental light sources by photoreceptor cells. It is generally used for medical and healthcare professional purposes, such as ophthalmology research.
4. Melanopic Ratio: This parameter reflects the relationship between Melanopic Lux and Photopic Illuminance. The higher the value, the stronger the light intensity inhibits Melanopsin (Melanopsin), the less melatonin secretion, and the more awake people are.
