In recent years, with the continuous improvement of living standards, people's requirements for the light environment of work and life are getting higher and higher, especially the problem of stroboscopic flashing of indoor lamps, which has attracted more and more attention. So, what exactly is the strobe of the luminaire, and what kind of damage will the strobe cause to the human body?
Dr. Hua Guichao, a well-known power supplier in the power supply company, pointed out that the development of high-quality driver ICs to provide constant current to LED lamps is to eliminate strobe and ensure that the lamps remain at a fixed brightness during the service life. The necessary way. It is hoped that the power supply manufacturer should have no stroboscopic and no damage as one of the most important design goals when designing the drive.
What is strobe?
Conventional luminaires are powered by alternating current, and their brightness varies with the periodic variation of the alternating current. The strobe of the luminaire is formed by the change of light and darkness of the light. It is usually divided into two types: one is that the frequency of change is below 100 Hz, and the stroboscopic light can be captured by the human eye; the other is that the frequency of change is above 100 Hz. This strobe will not be seen, but it has actually caused damage to the human body. The strobo light discussed below refers to invisible strobe.
What damage does the strobe bring?
There are related biological and medical studies on the possible damage to the human body caused by stroboscopic:
1.1 may cause brain cell damage
Some researchers say that by observing EEG, even if the stroboscopic light in the environment is so fast that it is undetectable, the retina of the organism can still resolve and respond to light with a frequency of 100-160 Hz or even 200 Hz. In animal experiments represented by cats, 100-120 Hz light has caused cell burns in the brain, and the burnt cells belong to the lateral geniculate body (1), which plays a role in controlling the eyeball (2).
1.2 may affect reading and vision
Studies have shown that the stroboscopic strobe of fluorescent lamps and CRT displays can affect the trajectory of eye movement when people read text. In addition, in some health check reports, visual impairment is caused by stroboscopic fluorescent lamps.
1.3 may induce migraine
Experiments have found that stroboscopic flashes with a frequency of 100 Hz may cause an increase in the incidence of headaches for office workers. Of course, this effect is often considered a special case and is only produced in special populations.
1.4 Reduce work efficiency and cause work injuries
In the light industry, food, printing, electronics, textile and other industries, the lighting field of straight tube type fluorescent lamps is commonly used, such as the flow line, the visual fatigue caused by stroboscopic, migraine, which will cause difficulties in positioning and low production efficiency; In the industry, such as crane operators, visual fatigue caused by strobo can cause difficulty in positioning, operation errors, and even accidents; when the speed of a moving object is multiplied by the stroboscopic frequency of the light source, the motion state of the moving object is generated. The erroneous vision of three states, such as stationary, inverting, and slow moving speed, is likely to cause an accident at work.
The following are some of the research results on the possible physiological effects of stroboscopic lighting:
In summary, invisible strobo does cause many potential hazards to humans and living things in many ways. Fortunately, we are welcoming the fourth generation of light sources - the era of LED lighting. LED lighting fixtures use a constant DC power supply, which is theoretically possible to achieve constant stroboscopic illumination. But in fact, due to the lack of industry standards, the market competition is fierce and disorderly. The market is filled with low-quality LED lamps, especially indoor low-power LED lamps, which also have stroboscopic problems. To get a pure and constant current source to ensure that there is no stroboscopic LED lighting, LED driving power is the biggest key.
Note:
(1) The hypothalamus contains a tissue called the lateral geniculate body. In the animal experiment represented by cats, the change in brightness of 100-120 Hz causes a chain burn of cells inside the tissue, and the geniculate body passes through the short nerve bundle. The connection of the upper thalamus plays a role in controlling the movement of the human eye.
(2) lateral geniculate body damage: clinically often associated with certain brain symptoms and signs, eye performance is mainly due to decreased vision, visual field defects and fever, convulsions, blood changes.
(3) Adrenal ketone has a function of regulating stress response and immune response in rodents and avians in amphibians, reptiles, and mammals. Studies have shown that adrenal ketone can damage memory in the recurrence of environmental panic memory.
Dr. Hua Guichao, a well-known power supplier in the power supply company, pointed out that the development of high-quality driver ICs to provide constant current to LED lamps is to eliminate strobe and ensure that the lamps remain at a fixed brightness during the service life. The necessary way. It is hoped that the power supply manufacturer should have no stroboscopic and no damage as one of the most important design goals when designing the drive.
What is strobe?
Conventional luminaires are powered by alternating current, and their brightness varies with the periodic variation of the alternating current. The strobe of the luminaire is formed by the change of light and darkness of the light. It is usually divided into two types: one is that the frequency of change is below 100 Hz, and the stroboscopic light can be captured by the human eye; the other is that the frequency of change is above 100 Hz. This strobe will not be seen, but it has actually caused damage to the human body. The strobo light discussed below refers to invisible strobe.
What damage does the strobe bring?
There are related biological and medical studies on the possible damage to the human body caused by stroboscopic:
1.1 may cause brain cell damage
Some researchers say that by observing EEG, even if the stroboscopic light in the environment is so fast that it is undetectable, the retina of the organism can still resolve and respond to light with a frequency of 100-160 Hz or even 200 Hz. In animal experiments represented by cats, 100-120 Hz light has caused cell burns in the brain, and the burnt cells belong to the lateral geniculate body (1), which plays a role in controlling the eyeball (2).
1.2 may affect reading and vision
Studies have shown that the stroboscopic strobe of fluorescent lamps and CRT displays can affect the trajectory of eye movement when people read text. In addition, in some health check reports, visual impairment is caused by stroboscopic fluorescent lamps.
1.3 may induce migraine
Experiments have found that stroboscopic flashes with a frequency of 100 Hz may cause an increase in the incidence of headaches for office workers. Of course, this effect is often considered a special case and is only produced in special populations.
1.4 Reduce work efficiency and cause work injuries
In the light industry, food, printing, electronics, textile and other industries, the lighting field of straight tube type fluorescent lamps is commonly used, such as the flow line, the visual fatigue caused by stroboscopic, migraine, which will cause difficulties in positioning and low production efficiency; In the industry, such as crane operators, visual fatigue caused by strobo can cause difficulty in positioning, operation errors, and even accidents; when the speed of a moving object is multiplied by the stroboscopic frequency of the light source, the motion state of the moving object is generated. The erroneous vision of three states, such as stationary, inverting, and slow moving speed, is likely to cause an accident at work.
The following are some of the research results on the possible physiological effects of stroboscopic lighting:
| light source | Strobe frequency | Physiological influence | Related research results |
| Ordinary fluorescent lamp (AC 60Hz) | 120Hz | Reduce vision performance | Veitch, JA and McColl, SL (1995) Lighting Res. Tech., 27(4), 243-256. |
| Display terminal | 70-110Hz grating | Affect visual scanning | Kennedy, A., Brysbaert, M., and Murray, WS (1998) QJ ExpPsychol A., 51(1), 135-51. |
| Ordinary fluorescent lamp | 100Hz-120Hz | Chain burn of cat brain cells in animal experiments | Eysel, UT, Burandt, U. (1984) Fluorescent tube light evokes flickerresponses in visual neurons. Vision Res., 24(9), 943-8. |
| Ordinary fluorescent lamp (AC 50Hz) | 100Hz | Avian blood adrenal ketone (3) disorder in animal experiments | Maddocks, SA, Goldsmith, AR, and Cuthill, IC (2001) General and Comparative Endocrinology, 124(3), 315-20. |
| Ordinary fluorescent lamp (AC 50Hz) | 100Hz | Animal experiments affect bird mating | Evans JE, Cuthill IC, and Bennett ATD (2006) Animal Behaviour, 72(2), 393-400. |
In summary, invisible strobo does cause many potential hazards to humans and living things in many ways. Fortunately, we are welcoming the fourth generation of light sources - the era of LED lighting. LED lighting fixtures use a constant DC power supply, which is theoretically possible to achieve constant stroboscopic illumination. But in fact, due to the lack of industry standards, the market competition is fierce and disorderly. The market is filled with low-quality LED lamps, especially indoor low-power LED lamps, which also have stroboscopic problems. To get a pure and constant current source to ensure that there is no stroboscopic LED lighting, LED driving power is the biggest key.
Note:
(1) The hypothalamus contains a tissue called the lateral geniculate body. In the animal experiment represented by cats, the change in brightness of 100-120 Hz causes a chain burn of cells inside the tissue, and the geniculate body passes through the short nerve bundle. The connection of the upper thalamus plays a role in controlling the movement of the human eye.
(2) lateral geniculate body damage: clinically often associated with certain brain symptoms and signs, eye performance is mainly due to decreased vision, visual field defects and fever, convulsions, blood changes.
(3) Adrenal ketone has a function of regulating stress response and immune response in rodents and avians in amphibians, reptiles, and mammals. Studies have shown that adrenal ketone can damage memory in the recurrence of environmental panic memory.
(This article is a copy of Infante)
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