What is LED eye protection desk lamp

What is LED eye protection desk lamp

LED eye protection desk lamp is a desk lamp with LED (Light Emitting Diode) as the light source.

principle

What is LED eye protection desk lamp

The eye protection table lamp is flicker-free, adopts high-brightness and low-light decay LED patch, and is driven by low-voltage DC12V switching constant current. The unique polarizing film light guide technology can make the LED light output evenly and directionally, without glare and glare, preventing myopia. Myopia eye protection table lamp [1] It is a no video flash, using blue light, ultraviolet isolation technology, and using a color rendering index of 94 or more. [1] The light source can be optimized through LED panel technology. [1] Now LED lighting has entered a new era, and a large number of LED products have entered household lighting, such as LED light strips, LED bulbs and LED desk lamps. During the test period, LEDs are only suitable for auxiliary lighting. . Atomic electrons have many energy levels. When electrons transition from high energy levels to low energy levels, the energy of the electrons is reduced, and the reduced energy is converted into photons and emitted. A large number of these photons are lasers. The principle of LED is similar. However, the difference is that LEDs do not emit light through electronic jumps inside atoms, but by applying a voltage across the PN junction of the LED to make the PN junction itself form an energy level (actually, a series of energy levels). level), and then electrons jump at this energy level and produce photons to emit light. New LED display devices have the advantages of low power consumption, high brightness, long life, and small size. This article starts with a brief history of the development of LED display devices. The development trend has certain reference value for Chinese engineers engaged in display device development. The world’s first commercial light-emitting diode (LED) was made of germanium in 1965, and its unit price was $45. In 1968, a breakthrough in the development of LEDs was achieved, using a nitrogen doping process to enable GaAsP devices to achieve efficiencies of 1 lumen/watt and to emit red, orange, and yellow light. By 1971, the industry had introduced GaP green die LEDs with the same efficiency. In 1972, a small number of LED displays were used for clocks and calculators. The world’s first watch with LED was originally sold in expensive jewelry stores, and its price was as high as 2,100 US dollars. Almost at the same time, HP and Texas Instruments also launched calculators with 7-segment red LED displays. By the 1970s, the price of LEDs had plummeted due to the proliferation of LED devices in home and office equipment. In fact, LED was the dominant digital and text display technology of that era. However, in many commercial devices, LED displays are also gradually facing fierce competition from other display technologies, such as liquid crystal, plasma and vacuum fluorescent tube displays.

This competition motivates LED manufacturers to further expand their product offerings and actively seek applications where LEDs have a clear competitive advantage. Since then, LEDs have been used in text dot matrix displays, light grids for background patterns, and bar-line graphics arrays. Digital displays continue to grow in size and complexity, from 2-digit numbers to 3-digit and even 4-digit numbers, from 7-segment numbers to 14- or 16-segment arrays capable of displaying complex combinations of text and graphics. By 1980, manufacturers began to provide intelligent dot matrix LED displays. This technological advancement enables LEDs to be used in outdoor sports information distribution as well as in automotive center high mount stop light (CHMSL) devices. The invention of high-brightness blue LEDs has made it possible to realize true-color advertising displays that can display true-color, full-motion video images. The advent of blue LEDs has made it possible to partially convert higher-energy blue light into other colors using backward-converting phosphorescent materials. All saturated colors in the CIE chromaticity curve can now be completely covered with LED light sources alone, and the organic integration of various color LEDs with phosphors can produce almost any color without limitation. In terms of reliability, the half-life of an LED (the time it takes for the light output to decrease to half its original value) is about 10,000 to 100,000 hours. In contrast, the half-life of small indicating incandescent lamps (here half-life refers to the time when half the number of lamps fail) is typically in the range of 100,000 to several thousand hours, depending on the rated operating current of the lamp. [2]

Advantages and disadvantages

Table lamps are generally used in places such as reading, writing, designing, and reviewing office or learning lighting. For those who do desktop work, ensuring a good visual environment in the work area is of great benefit to improving the quality of study and office work, improving work efficiency and protecting physical health. In places where desk lamps are used, if the illumination of the lamp is low and the color rendering is poor, it will cause visual fatigue of the reader, and the long-term stroboscopic or glare of the lamp will cause serious damage to the human visual nervous system, so special attention should be paid to it. Pay attention to the quality of lighting. Only by fully analyzing the characteristics of lighting and selecting suitable lamps, and at the same time making life more colorful, from the perspective of satisfying human lighting comfort and health, and considering energy saving.

main disadvantage

The main disadvantages of LED eye protection table lamps are as follows: (1) The quality is uneven, the LED industry has low barriers to entry, the quality of various LED chips varies greatly, and ordinary consumers cannot distinguish them, so the market is relatively chaotic (2) Start At this stage, LED lighting is mainly used in large-scale landscape lighting, and it is not suitable for high-eye environments. It is mainly used for testing (3) blue light intensity is high, blue light is harmful, and the eyes are extremely vulnerable (4) monochromatic light source, too high color spectrum. Narrow, it will affect the optic nerve of the eyes, and it is easy to get tired. (5) The small LED lamp beads will gradually wear out after a few years of use and cannot be replaced, which will easily cause the entire lamp to be scrapped. (6) The color temperature is basically above 5000K, pure white is very Bright and dazzling (7) LED eye protection lamps with poor workmanship will produce slight stroboscopic and radiation. (8) Adapters generally have a shorter lifespan than small LED lamp beads, and the transformer is easier

main advantage

The main advantages of LED eye protection desk lamps are as follows: (1) Environmental protection: no pollution, no ultraviolet, no infrared rays and no heat radiation; (2) Low energy consumption design, 150 hours of power consumption only once, when the lamp provides enough lighting, the power The smaller the better. The light source made of semiconductor technology has a very high photoelectric conversion efficiency, so that the electric energy you provide can be turned into light to the maximum extent. DC power supply effectively eliminates extra electromagnetic losses and further reduces the overall energy consumption, so that the power of the whole machine is less than 7.5w (3) The long-life light source does not need to replace the light bulb for 10 years, which is 100 times that of ordinary light bulbs (4) The light source does not contain toxic heavy metals such as tungsten and mercury. The semiconductor light source has neither the tungsten filament in the incandescent lamp nor the mercury in the fluorescent lamp and the energy-saving lamp. (5) Safety. 12V low-voltage DC power supply; no glass parts that are easily broken to ensure the safety of the user. 36V can be felt by the human body. The minimum voltage, less than 36V power supply is safe for human body. 3C certification is not even required. DC power supply eliminates the electromagnetic radiation pollution of high-frequency alternating current.

blue light hazard

The main reason for the blue light hazard of LED eye protection desk lamp is that the white light emitted by the light source of high-energy short-wave blue LED desk lamp can be formed mainly by blue light with a wavelength of 450-455NM to excite phosphors, and the lower the wavelength, the stronger the firing ability. Usually, the factory wavelength of LED light source is controlled within 500NM, generally 450~455NM or 455~460NM, which belong to the section with the strongest radiation damage. If the wavelength becomes larger, the ability to excite the phosphor decreases, and the luminous efficiency decreases. In order to pursue brightness, manufacturers usually strengthen the blue light intensity of LED light sources. If the human eye looks at such a light source for a long time, it is inevitable that the eyes will be damaged by blue light. In addition, there is another point, the longer the LED desk lamp is lit, the faster the phosphor in the light source decays, and as a result, the light in the blue light band that is in contact with the human eye will become more and more intense, thereby causing damage to the human eye. Therefore, when the eyes look at the LED light source for a long time, it is easy to make people feel dizzy and uncomfortable, and even cause eye damage, which will increase the probability of eye disease. Reminder, do not let your eyes stare at the bright LED light source for a long time to avoid eye damage. Home LED lighting should be used as little as possible, especially LED eye protection lamps are in the experimental period, and LEDs are only suitable for auxiliary lighting. A research report by German ophthalmologist Professor Richard Funk (RHW Funk) pointed out that when “unsuitable light” continues to illuminate our eyes, it will cause dysfunction, especially trichromatic lights, computer screens, etc. High-energy short-wave blue light of regular frequency, these short-wave blue light have extremely high energy, can penetrate the lens to reach the retina, cause photochemical damage to the retina, and directly or indirectly cause damage to cells in the macular area. Therefore, for us normal people, blocking blue light for a long time is the most effective way to reduce damage, and the use of anti-blue light glasses can effectively solve this problem. Ordinary anti-radiation glasses can only filter ultraviolet rays and certain electromagnetic radiation, and Blue light cannot be filtered. Special anti-blue light glasses can not only effectively isolate ultraviolet rays and radiation, but also filter more than 90% of blue light. They are suitable for use when watching a computer or TV. They can greatly reduce the irritation of blue light to the eyes and eliminate discomfort such as soreness, fever or pain in the eyes. Relieve eye fatigue. [2]

Light knowledge

Infrared Infrared is a type of thermal radiation. Stronger infrared rays can cause skin damage. The penetrating power of infrared rays is stronger than that of ultraviolet rays. If the eyes are stimulated too much by infrared rays, the retina inside the eyeball will be injured. Different wavelengths of infrared rays can cause different damage to the eyes. Ultraviolet light not only comes from the sun, but our daily life can inadvertently come into contact with ultraviolet light from various sources, welding light, ultraviolet light for disinfection, and even some daily fluorescent lamps. Eye damage, mainly manifested as photophobia, tearing, detachment of corneal cells, lens opacity and even retinal damage. Short-term strong radiation and long-term weak radiation can cause the same damage to the eyes. Especially children under the age of 10 crystals can transmit 75% of ultraviolet light. It can be seen that children can not ignore the protection of ultraviolet light, even the protection of weak ultraviolet light of fluorescent table lamps is also very important. According to the survey, the impact of ultraviolet rays on people is accumulated for life. Long-term exposure to harmful ultraviolet radiation will induce cataracts, macular degeneration and other eye diseases. These eye diseases are one of the main causes of blindness after the age of 60. Electromagnetic radiation When electronic products work, they emit electromagnetic waves, also known as electromagnetic radiation. Electromagnetic radiation on the human body will produce a series of biological effects. The frequency band of 150-1200 MHz can penetrate more than 2 centimeters into the human body, stimulate the deep cells of the body, make them rub against each other to generate heat, and interfere with the body’s own biological current. Electromagnetic energy is converted into heat energy in the body, causing the imbalance of the body’s thermal balance; it can cause “microwave cataract”; destroy the spermatogenesis ability of the testis, leading to infertility; causing changes in cardiovascular function. Children’s nervous systems are delicate, and if they are exposed to strong electromagnetic radiation, their brain development will be delayed and their biological clocks will be disturbed. For pregnant women, it is easy to cause miscarriage, premature birth, and even lead to fetal malformations. Italian medical experts reported that 400 children in the country suffer from leukemia every year. Among them, children aged 2 to 7 years old suffer from excessive electromagnetic radiation due to being too close to the electromagnetic field. Poland’s data pointed out that people who are often exposed to electromagnetic radiation have 2 times the incidence of various cancers than ordinary people. The Royal Microwave Research Institute of the United Kingdom found that people who often work under electromagnetic radiation have 6.4 times the incidence of brain tumors. Medical experts in Finland have shown that female flight attendants are twice as likely to develop breast cancer than women of the same age. Medical reports from the United Kingdom, the United States and Canada also pointed out that the proportion of skin cancer and brain cancer among the staff on the plane is relatively high. If the human body is affected by high-intensity electromagnetic wave radiation for a long time, it will cause central nervous system symptoms such as dizziness, insomnia, fatigue, irritability and memory loss, and also cause autonomic dysfunction, resulting in bradycardia, tachycardia, blood pressure fluctuations, etc. Cardiovascular disease.

How to buy

How to choose LED eye protection desk lamp First, “no stroboscopic” is the minimum condition for eye protection lamp. The fluorescent eye protection lamps on the market generally have stroboscopic phenomenon, but everyone does not feel it. Second, please buy a desk lamp with a yellowish white light, not a desk lamp with a blue and white light. According to scientific verification, blue and white light has certain damage to the human eye, commonly known as blue light hazard, and long-term use will cause damage to the eyes, while the light yellow and white light is suitable for reading and writing lighting. Third, color rendering is an important requirement for eye protection desk lamps. If the color rendering of the light is poor, it is difficult to restore the original color of the illuminated object. The easiest way to check the color rendering is to use the blood-red color of the palm to check the color rendering of the lamp. Under the light, the blood-red color of the palm is brighter. If there is no blood, the color rendering is not good. Color pictures can also be used for comparison. Fourth, in general, the power of the eye protection desk lamp is between 9W and 18W to meet the desktop illumination requirements for reading and writing lighting. The light power should also be matched with the brightness and darkness of the surrounding environment, and the brightness of the light and the environment should not be too different. In the case of low ambient brightness. LED eye protection table lamp purchase knowledge LED eye protection table lamp purchase is mainly considered from four aspects: 1. National 3C compulsory certification. Avoid buying LED lamps from small workshops. 2. Color temperature, if the color temperature is too high, the light will be pale and visually dazzling; if the color temperature is too low, the light will be yellow, and the eyes will be easily tired; the most suitable color temperature is about 5000K, and the light is yellowish. 3. Brightness, too bright or too dark will cause eye fatigue, so appropriate brightness is very necessary (it is recommended to choose a desk lamp with stepless dimming) 4. Optical processing, because LED desk lamps use LED chips as the light source, they belong to the point Light source, so reasonable optical processing technology is very necessary

proper maintenance

How to properly maintain LED lighting The rhythm of modern people’s life is always in a hurry, and some details of life are rarely taken into account. For example, I don’t know the correct maintenance method for the beautiful lighting that I bought back in my home decoration, and I seldom care about what happens to the lighting. If it is broken, I may continue to buy new ones. The correct way to maintain the LED lighting at home: First of all, remember to buy After returning to the lamp, don’t rush to install it first, you should carefully read the marking of the lamp and read the installation and use copy, and then install and use the lamp according to the rules of the copy, otherwise there may be risks. Second: Replace the aging lamp in time according to the light source parameters provided by the logo. If you find that the two ends of the lamp are red, the lamp is black or there is a shadow, and the lamp does not turn on, you should contact the manufacturer in time. Replace the lamp tube; third: during clean maintenance, you should be careful not to change the structure of the lamp, and do not change the parts of the lamp at will. After the clean maintenance, the lamp should be installed as it is, and do not miss or wrongly install the lamp parts. ;Fourth: Try not to switch on and off again and again when using LED lamps, which will greatly shorten the service life of LED lamps.

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