Don’t indulge in empty shouting”People-oriented design”, Melanopsin illumination (EML) to understand?
We have all learned basic knowledge about light color: low color temperature makes people feel comfortable and warm, and high color temperature makes people sober and excited.
▲ photos from gel-usa.com
Obviously, designers will use a higher color temperature in the office and a lower color temperature in the bedroom. This is a “people-oriented” design.
Why does it make us feel comfortable with the low light and warm ocean light? This leads to the next key word:
Melanopsin
Humans have never been nocturnal organisms. Gathering of hunting for 180,000 years and arable land for 20,000 years have given rise to a pattern of working during the day and sleeping at night.
The pineal gland of the human brain secretes a hormone: melatonin, which is a “natural sleeping pill” and a spontaneous “rest signal” of our body. When there is a high content of melatonin in the body, we are lethargic; when there is a low content of melatonin, it will be sober.
The amount of melatonin is related to the strength of light. The eye senses the brightness of the environment and transmits the signal to the pineal gland to control the secretion of melatonin: more in the dark and less in the strong light. This is why people are more likely to fall asleep in the dark.
The intraocular melanopretinal retinal ganglion cells (ipRGCs) sense the intensity of the light and transmit the signal to the pineal gland.
▲ The photoreceptor cells of melanopsin are most sensitive to the light of blue wavelengths, and the blue light of 450-470 nm is the most effective to inhibit the secretion of melatonin.
The “artificial lighting” of the ancestors was only a fire light. The following figure shows the spectrum of the fire light: the color temperature is 2000K, and there are few blue lights and many red lights. This low-colored, warm ocean light makes people feel comfortable and accelerates to sleep.
In the work environment, high color temperature light with more blue components can prevent daytime sleepiness. Before work, less warm blue light with blue light causes the brain to send signals “reduce energy consumption and prepare for rest”, relaxing and sleeping at night. will be better.
