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What is the luminous flux of a fluorescent lamp?
Jul 19,2012
It is well known that prolonged exposure to ultraviolet radiation can kill a large number of human cells. So, how many people pay attention to the invisible ultraviolet rays contained in ordinary energy-saving lamps and fluorescent lights, and how many people know how much harm it can cause to the human body? American biochemist Anderson found that people who live or work under fluorescent lights for a long time receive 50% more ultraviolet radiation than those who are not frequently exposed to fluorescent lights, and their chances of developing skin cancer are much higher than normal.
In addition, the light waves emitted by fluorescent lights can cause a large number of genetic mutations in cells within living organisms, increasing the number of abnormal cells and leading to the death of normal cells.
In major cities in China, about 40% of the lamps in ordinary households are fluorescent lights, while about 80% in offices and over 95% in school classrooms. However, tests show that most fluorescent lights emit varying degrees of ultraviolet radiation, with some even reaching levels sufficient for disinfection. The Shanghai Lighting Society conducted research on topics such as "the relationship between lighting and the vision health of adolescents." Among them, Professor Xu Xueji from Fudan University found that one type of energy-saving fluorescent lamp on the market emitted ultraviolet rays at 254 nanometers. Xu stated that this result is very surprising because fluorescent lights use ultraviolet rays to excite phosphors to emit light, and all fluorescent lights (including energy-saving fluorescent lights) contain ultraviolet rays. However, the ultraviolet rays in that particular lamp were strong enough to be used for disinfection, which could potentially cause significant harm to the eyes if used for close-range lighting.
According to Wu Hong, an expert from the China Green Lighting Project Promotion Office, after testing many representative brands of fluorescent lights on the market in Shanghai, they also felt concerned because most of the fluorescent lights emit varying degrees of ultraviolet radiation. At a distance of 1 to 2 meters from the fluorescent light, the ultraviolet rays can cause some harm to the eyes, and within 0.6 meters (which is generally the height of a desk lamp), the harm is even more severe. Additionally, due to the promotion of energy-saving fluorescent lights, the use of fluorescent desk lamps in households in major cities has increased from about 20% five years ago to about 40% now, which continuously increases the potential harm of ultraviolet fluorescent lights.
Dr. Zhou Xingtai from the Eye, Ear, Nose, and Throat Hospital affiliated with Fudan University pointed out that short-term exposure to strong ultraviolet rays can cause acute damage to the corneal epithelium and symptoms such as tearing and photophobia. However, long-term repeated exposure to ultraviolet radiation can damage the lens and retina of the eyes, leading to vision loss, cataracts, and even blindness. One important reason for the high incidence of cataracts in high-altitude areas is the strong ultraviolet rays in sunlight.
So how should one choose fluorescent lights? Experts suggest that first, one should choose products that have been tested and certified by authoritative institutions such as the National Electric Light Source Product Quality Supervision and Inspection Center. Secondly, do not be tempted by cheap prices and buy low-quality products that are overly cheap, like those found at street stalls. However, experts point out that ultraviolet rays are invisible light, and consumers cannot see whether there are any or how much there is. The root of the problem is that, so far, there are no regulations in China to limit ultraviolet radiation from fluorescent lights. Therefore, for the health of citizens, especially to effectively protect the vision of adolescents, experts call on relevant departments to establish market access systems to prevent "ultraviolet lamps" from harming the public.
LED diodes, as the latest fourth-generation light source, are energy-saving and environmentally friendly, containing no heavy metals and emitting no ultraviolet rays. They are energy-saving lighting products strongly promoted by the state and the world.
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