People will habitually think that lighting mainly has visual function. In fact, lighting also has physiological functions, which control our biological clock, affecting our health and our emotions. In 2002, David Berson of the University of Brown in the United States discovered a new photoreceptor cell, which is a retinal Ganglion Cells (RGCs). This photoreceptor cell is directly connected to the pineal gland of the hypothalamus, thereby affecting the physiological function of the human. Like rod-shaped cells and cone-shaped cells on the retina, such nerve-knotted cells are also sensitive to different wavelengths of light, and are most sensitive to blue light having a wavelength of about 460 nm. In the early morning, the surrounding light environment is in a state of high color temperature. The blue light is rich in components, stimulating the nerve knot cells on the retina, increasing the concentration of cortisol in the body and inhibiting the secretion of melatonin. In this way, as soon as we get up early, our body is full of energy and energetically start a day's work. By dusk, the surrounding light environment gradually became a state of low color temperature. The composition of blue light was small, which reduced the secretion of cortisol in the body and increased the concentration of melatonin. Therefore, we gradually felt tired and needed rest and sleep. Natural light is the way to control the body clock in our body through the nerve knot cells on the retina, so that our physiological activities adapt to the rhythm of day and night and the four seasons. Therefore, if our lighting can change like daylight, we can provide us with a comfortable and harmonious light environment, which will improve work efficiency and enhance our health. Compared to pass-through light fixtures, LED luminaires make it easier to achieve such illumination.
Nowadays, with the improvement of LED light efficiency and the improvement of performance, the application of LED street lamps has received much attention. Road lighting is a low-intensity lighting. What kind of lamp spectrum is good for low-level lighting? What color temperature light source should be used in road lighting? Is it warm white or neutral light or cool white? Up to now, many questions have no clear answer. Therefore, in addition to strengthening the research on the optical design of LED lamps, we should cultivate a group of high-level optical design talents, further standardize the performance indicators of LED lamps, especially the indicators of optical characteristics, and also strengthen the visual and physiological effects on lighting. Research to further clarify the influence of the spectrum (color temperature, color rendering) of the light source on the illumination.
Therefore, it is recommended to increase the research on the visual function and biological function of illumination in the LED lighting application research project, especially for the spectral characteristics (color temperature, color rendering) of light sources suitable for places such as roads that require low-intensity illumination. (From "Semiconductor Lighting" magazine, 2010, Issue 4, edited by maysoong)
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