The 130-year-old incandescent bulb produced only 15 lumens of light per watt of energy. The fluorescent tube that was born 60 years ago has energy efficiency of 60 to 90 lumens per watt, but in addition to energy saving, many other shortcomings. And the issues that may be derived are also worthy of attention:
Classroom lighting
"My child has been in school for more than a year, and his eyesight has dropped significantly." This is a careful mother's concern about her child's decreased vision. She always thought it was a problem with reading posture. Recently, she learned that the school's lighting environment is not Caused by science. The latest national primary and secondary school students' myopia prevention and treatment sampling results show that the primary school students' myopia rate is 26.96%; the junior high school students are 53.43%; the high school students are more than 72%. At present, the problem of the decline of visual acuity of primary and secondary school students in China has caused widespread concern among lighting experts and scholars. In addition to the excessive burden of learning, the use of eye hygiene and the lighting environment are also important reasons that cannot be ignored.
Expert suggestion: In the classroom lighting source selection, about 4000K medium color temperature LED should be used as the main light source. High and low color temperature light sources can aggravate students' brain fatigue and visual fatigue, reduce learning efficiency, and should not be used as the main source of classroom.
Shopping mall lighting
According to media reports, some Nanjing citizens have got a strange disease in the 11th holiday. As long as they go shopping, they will feel dizziness, chest tightness and other physical discomforts, and this feeling is aggravated with the time of shopping, but just go out of the mall. The symptoms will disappear automatically afterwards. The health experts analyzed the causes of these symptoms in addition to the population density is too large, poor ventilation, ultraviolet light, stroboscopic, electromagnetic radiation, etc. of shopping mall energy-saving lamps are also important reasons.
The culprits of the above-mentioned situation are energy-saving lamps. Fluorescent lamps are known to use ultraviolet vapor to form ultraviolet rays, and then ultraviolet rays are used to excite the phosphors to emit light. Spectral intermittent spikes and stroboscopic lights, electromagnetic radiation and the like may be detrimental to health problems. .
The LED lighting is a high-end technology that applies the backlight module. The LED point source is refracted and reflected to diffuse the light, making it a uniform light source with a soft distribution, and controlling the distribution of light to the designed light. Within the range of strong distribution curves, it does not cause glare.
In the face of practical problems in life, I have listed some sporadic knowledge about traditional energy-saving lamps and LED lighting to readers.
First, the principle of the energy-saving lamp is that the mercury vapor is excited to emit light, so each energy-saving lamp contains mercury. Even with the latest environmental standards in Europe, an energy-saving lamp has a mercury content of about 3-5 mg. Once broken, only 3 milligrams will pollute about 1,000 tons of water and 300 cubic meters of air! It is predicted that mental illness will prevail in this century, because the poisoning of mercury is mainly to damage nerves.
LED is a solid light source, free of mercury and harmful gases, so it is environmentally friendly.
Second, the research of the Institute of Dermatology and Skin Cosmetology of China Medical University shows that the ultraviolet light absorbed by working under the fluorescent lamp and studying for one day is quite exposed to sunlight for one hour. Ultraviolet radiation directly destroys the body's immune system, kills white blood cells, damages the chemical bonds between nucleic acids and proteins, causes genetic (DNA) mutations, and even cancer.
LED lighting is a non-UV radiation source that does not attract mosquitoes. It is not only healthy and clean, but also the first choice for home lighting.
Third, the European Commission for Lighting (European Commission) issued the "90/270/EC Guide", emphasizing the need to solve and reduce the stroboscopic effect of the luminaire to solve the problem of causing migraine and optic neuropathy. My national AC power is 50HZ, the light of the fluorescent lamp per second should be flashed 50 times. Under this flashing light, people are prone to myopia. (You can think about it: from vegetable oil lamp, kerosene lamp to incandescent lamp, fluorescent lamp, the brightness of lighting is gradually increasing. However, the visual acuity of young people is declining year by year, and the degree of aging is also increasing.); Moving objects may have ghosting phenomena. For example, fluorescent lamps cannot be used in stadiums, especially small balls such as table tennis and badminton. It is almost impossible to play under the fluorescent lamps. The rotating machine tool in the production workshop will cause the illusion of reversal or stillness of the human eye when the fluorescent lamps are illuminated, resulting in an accident.
LED lighting has low-voltage DC power supply, there is no periodic alternating power supply voltage, so there is no stroboscopic effect, eliminating the visual hazard caused by the stroboscopic light of traditional light source. It is now recognized as a health light for vision, especially for young people. .
4. At present, the energy-saving lamps commonly used by people, like mobile phones and computers, emit electromagnetic radiation when they work. According to research conducted by the Medical Research Center of Cambridge University and the Vienna Headquarters of the International Commission on Illumination, electromagnetic radiation may cause palpitations, insomnia, and leukopenia. Memory loss, cardiovascular and other organs, nervous system damage, and electromagnetic radiation damage is cumulative.
The LED light source works in the DC/low voltage state, and there is no electromagnetic radiation, so it will not cause electromagnetic radiation damage to the human body.
In addition, some companies produce LED lighting lamps with patented LED high-efficiency power supply, and are suitable for wide voltage supply. The global (85V-280V) guarantees the life and brightness without being affected by voltage fluctuations, making the electro-optic power conversion close to 100%, and the luminous efficiency exceeds 120LM/W, more than 92% energy saving than incandescent lamps, 80% energy saving than traditional energy-saving lamps, and service life of up to 15 years, greatly reducing the replacement and maintenance costs of light sources, and the current price is not better than high-quality energy-saving lamps. Expensive (high-quality energy-saving lamps 1 yuan / watt, LED lights 10 yuan / watt).
The color temperature of LED lighting ranges from 2,000 to 8,000 K, covering 3,000 K in the morning, 5,500 K in the noon sun and 2,500 K in the setting sun. Low color temperature light will give people a kind and warm feeling, which will make the human body relax and help sleep. The high color temperature white light gives people a refreshing and light feeling, which gives people a good spirit and can stimulate the production of conscious hormones. Different color temperatures can regulate the physiological clock and rhythm of humans and living things. The important influence of color temperature on human physiological clock and health should be the primary functional indicator of illumination source. The color temperature of LED lamp is available for selection.
The above is the knowledge of LED lighting and traditional energy-saving lamps. In the global environment of promoting energy conservation and emission reduction, and our concern about the health of ourselves and our family, we should also make rational choices.
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