While the electric light source brings light to humans, it also brings new harm to human beings due to the stroboscopic light source, that is, the stroboscopic effect.
The stroboscopic effect refers to two concepts. One is stroboscopic, that is, the depth of the luminous flux of the electric light source, the greater the undulation depth, the greater the stroboscopic depth; the second is the stroboscopic effect, that is, the stroboscopic effect of the electric light source is negative in people's vision. Effect, the more severe the strobe, the greater the negative effect, the greater the harm. The stroboscopic and stroboscopic effects are directly related to the type of electric light source and its technical performance. The stroboscopic and stroboscopic effects of different types and different technical performances are different, and the harm of stroboscopic and stroboscopic effects of electric light source is correctly recognized. Sexuality, scientific understanding and improvement of technical measures are of great scientific significance for the construction of a bright and comfortable green lighting environment.
1, the stroboscopic depth of common electric light source
At present, in the production field and daily life, the most widely used electric light sources are incandescent lamps, high pressure mercury lamps, high pressure sodium lamps, metal halide lamps, straight tube (inductive) fluorescent lamps, and high power factor trichromatic fluorescent lamps.
The stroboscopic depths of several electric light sources are listed below:
Incandescent lamp | High pressure mercury lamp | HPS | Metal halide lamp | Straight tubular shape (inductance) | High power factor trichromatic fluorescent lamp | |
| Strobe depth | 50% | 65% | 65% | 65% | 55% | 5% |
Strobe frequency | 50Hz | 50Hz | 50Hz | 50Hz | 50Hz | 40KHz |
2. Harmfulness of stroboscopic effect<br> The stroboscopic effect of electric light source causes irreparable serious harm to human production, daily life, physical and mental health, mainly in the following aspects:
1 Initiating an accident at work, when the stroboscopic frequency of the electric light source is in integral multiple with the speed (rotational speed) of the moving (rotating) object, the motion (rotation) state of the moving (rotating) object will be static. The inversion, the slow movement (rotation), and the erroneous vision of the above three states are periodically repeated, causing a work-related accident.
2 For example, the sewing machine operator in the garment industry illusion that the needle moving up and down at high speed is in a static state, and the finger is inadvertently injured.
3 Another example is the machine tool processing industry, the machine tool operator, the illusion of the forward rotation of the turning tool is reversed, and the emergency reversing operation, damage to the workpiece, the tool, and even cause casualties.
4 In the machining industry, the crane operator has difficulty in locating the movement state of the crane and the hook, and even has the wrong vision such as slow movement speed and instant static, causing accidents caused by operation errors.
5 caused low production efficiency. The stroboscopic effect can cause visual fatigue and migraine, especially in the mechanical industry. High-pressure mercury lamps, high-pressure sodium lamps, metal halide lamps and light industry, food, printing, electronics, textile and Other industries generally use straight tubular (inductive) fluorescent lamps. Especially in lighting situations. For example, if the plug-in operation of the assembly line on the assembly line is difficult to locate, it is easy to cause migraine due to visual fatigue, vertigo, or eye pain, which makes the production efficiency low; the color of the meat of the meat processing factory is not fresh, and the epidemic prevention test is not qualified, but When you get the sun, your color is normal.
The technical reasons for the stroboscopic electric light source are not only the factor of the power supply, but also the factor of the backward performance of the electric light source technology and the unreasonable factor of the lighting design, etc., and are the result of a combination of factors. The technical mechanism is more complicated. Due to space limitations, this paper only conducts general technical analysis from the perspective of the performance of existing common electric light source technology.
The frequency of the electric light source power supply is low, such as incandescent lamp, high pressure mercury lamp, high pressure sodium lamp, metal halide lamp, straight tube (inductor) fluorescent lamp. At this stage, most of the 50Hz power frequency sinusoidal alternating current directly supplies power to the electric light source illuminator. The frequency is 50Hz×2=100Hz, and the sine wave is fluctuating regularly, and the power supply voltage of the electric light source fluctuates greatly. At present, the instantaneous voltage value of power frequency AC in China is between 10% and 20%, which greatly increases the stroboscopic depth of the sine wave with a frequency of 100Hz.
The performance of the electric light source technology is backward: the incandescent lamp is a radiation source that directly heats the filament, and the luminous power of the illuminator must fluctuate with the sine wave law of the frequency of the power supply. High-pressure mercury lamps, high-pressure sodium lamps, metal halide lamps, and straight tubular (inductive) fluorescent lamps are gas-emitting electric light sources, but they use inductive ballasts (without AC-DC-AC) for their starting and ignition. Therefore, the discharge power of the gas discharge tube must also fluctuate with the sine wave law with the frequency of the power supply.
The fundamental technical countermeasure for improving the stroboscopic of the electric light source is to increase the electric power driving frequency of the electric light source illuminator to reach 40 KHz or more. From the macroscopic point of view, there are many measures to improve the electric power driving frequency of the electric light source illuminator, but at this stage, some technologies are impossible to realize or realize the cost is too high. The most likely and most economical and effective way is to choose a new electric light source with AC-DC-AC frequency conversion.
Considering the application environment of electric light source, luminous flux (brightness), color rendering performance, stroboscopic effect, energy saving effect, performance price ratio, lighting quality, etc., the most practical one is high-power three-primary fluorescent lamp (energy-saving lamp). The basic principle of this kind of energy-saving lamp is an all-electronic ballast with AC-DC-AC frequency conversion function, which converts 50Hz 220V power frequency AC power into smooth DC power, and converts DC into 40KHz high frequency through frequency conversion oscillator. AC power is applied to the trichromatic fluorescent tube to drive the fluorescent tube to discharge light. Due to the high fluctuation of the driving power frequency, the stroboscopic depth of the fluorescent tube is less than 5%, and there is no stroboscopic effect. The scientific calculation test proves that the electric power frequency for driving the fluorescent tube discharge should be between 40KHz and 80KHz, and the higher the frequency within this range, the smaller the stroboscopic depth of the fluorescent tube, the smaller the stroboscopic effect and the less harmful. .
The use of Rongtai series of three-color high-power fluorescent lamps can eliminate the harmful effects of stroboscopic effects, and can improve color rendering performance and light efficiency, reduce power consumption, and improve brightness. It is an ideal light source for building a bright and comfortable green lighting environment.
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