Because of the use of alternating current power supply, the brightness of traditional lamps varies with the periodic change of alternating current. Lamps and lanterns are formed by light and dark changes, usually divided into two kinds: one is the frequency of change below 100Hz, and the strobe can be caught by the human eye; the other is that the frequency is above 100Hz, and the strobe is not seen, but it has actually caused harm to the human body, the frequency discussed below. Flicker is an invisible stroboscopic.
May cause brain cell damage
Some researchers say that by observing the electroencephalograph, even if the light flicker in the environment is undetectable, the retina of the organism can still distinguish 100-160Hz, or even up to 200Hz, to respond. In animal experiments represented by cats, 100-120Hz's light has caused brain cell burns. The burn cells belong to the lateral geniculate body (1), which plays a role in controlling the eyeball (2).
It may affect reading and eyesight
Studies have shown that the luminance stroboscopic of fluorescent lamps and CRT displays affect the eye movement trajectory of people in reading, and in some health examination reports, visual impairment is caused by flicker of fluorescent lamps.
Migraine may induce migraine
It was found that the frequency of 100Hz - frequency flicker could cause a multiplier of the incidence of headache in office workers. Of course, this effect is usually considered a special case, only in a special group.
Reducing work efficiency and causing industrial injury
In light industry, food, printing, electronics, textile and other industries, the lighting fields of direct tube type fluorescent lamps are generally used on the pipeline, and the visual fatigue and migraine caused by stroboscopic are difficult to locate, and the production efficiency is low. In the mechanical industry, such as the crane operator, the visual fatigue caused by the stroboscopic will cause the determination. When the velocity of the moving object and the frequency of the stroboscopic frequency of the light source are multiple, the motion state of the moving object will produce three kinds of periodic repetitive error vision, such as static, reverse, slow motion and so on.