Walking on the road where people come from the car, red, green, yellow, blue... The lights of various colors come into view. Light pollution, this issue is very interesting. The children in school are wearing glasses when they are young. The light problems in life have seriously affected the children's eyes. How to create a safe and healthy light environment deserves attention. In the decoration, how to handle the lighting problem? How to give children a healthy lighting environment? The following will introduce you from the selection of lights and light source design.
Phenomenon 1: LED light price is difficult to choose
Experts: Mo Buy 5W Bulbs Below $20
Consumers in the lighting market to buy LED indoor lights, often see confusing phenomenon: a well-known brand 4W LED bulb lamp price 40 yuan, and some unknown brands 5W LED bulb light only Sell ​​20 yuan one. Which bulb lamp should be selected in the two bulb lights? Many consumers told reporters that they tend to choose brighter LED bulbs.
Because the higher the color temperature, the higher the light efficiency, the brighter the LED interior light looks. However, in actual use, the low color temperature looks more comfortable and the corresponding cost is higher. Taking sunlight as an example, the morning and evening sunlight with a color temperature of between 3000K and 3500K looks soft. At noon, the color temperature of the sun rises to 4000K to 4500K, which is already more dazzling. The color temperature of incandescent and fluorescent lamps reached 6200K.
The reporter learned that light bulbs produced by regular domestic manufacturers will be marked on the packaging color temperature, the common color temperature is 2700k, that is, the color temperature of ordinary incandescent lamps, which is characterized by feeling the light is warm, but not bright enough, suitable for bedroom bedside, wall lamp, etc. Local lighting; 3000k is the closest to the natural light color temperature, is warm, light is warm and bright, suitable for the overall lighting design at home; 5000k above is white, is a cool light, can make people concentrated, suitable for office, learning and other places use.
Experts said: At present, in the lighting market, the general household LED indoor lamp power is between 3W ~ 7W, 5W bulb lamp market sales price is generally around 50 yuan, if less than 20 yuan, then the LED indoor lamp Quality is certainly a problem, not only can not play a role in protecting vision, and the life of the light source will be greatly reduced. In addition, when consumers purchase LED interior lights, they can't just look at the power of the lamps, because the LED lamps are not as bright as possible.
Phenomenon 2: The poor quality LED lamp has blue light hazard
Experts: Mo is cheap and wants to buy big brands
From incandescent lamps to energy-saving lamps to LED lights. In recent years, society has paid more attention to energy-saving lighting products than ever before. In this regard, some medical professionals and electric light source experts have pointed out that many LED lamps have serious problems of blue light overflow. Over time, the eye's retina will be subject to irreversible damage.
Is LED lighting really damaging to vision? Associate Professor Zhang Shanduan, deputy director of the Institute of Electric Light Sources at Fudan University, told the reporter: “The principle of white LEDs is that blue LED chips excite the white light formed after the conversion of yellow phosphors. Blu-ray damage refers to the fact that if the brightness of the light source is between 400 and 500 nanometers, if the brightness is too high, Eyes that look directly at the light source for a long period of time may cause photochemical damage to the retina. The degree of blue light damage depends on the amount of blue light that the human eye accumulates in the light.â€
"If you buy a qualified lamp and use it properly, the LED lamp is no more dangerous than the traditional lamp." Industry sources pointed out that at present, there are more than 3,000 domestic LED lamp manufacturing enterprises, China's national standard "light and lamp system of light In the "Biosafety," a clear definition is made on the hazards of blue light and the calculation method for quantification, and it is pointed out that there is no difference between LED lighting products and other light sources, and it falls within the safe range specified by the limits of exposure radiography.
Experts said: Prof. Tong Tongsheng of the Department of Optoelectronic Engineering at Zhejiang University stated that internationally, the photobiological safety standards for blue light have been formulated according to the intensity of blue light, and the possible blue light hazard values ​​have been set. For example, a light source product that does not have a Blu-ray hazard is called a “zero productâ€; a product that has less blue light hazard and whose eyes cannot look directly at a light source for a long time is called “a productâ€; a light source that has a greater blue light hazard is called "Second category product". Currently used as the basic zero-class and one-class LED lighting, if it is the second category is forced to mark "eyes can not stare at." Therefore, when purchasing LED lamps, do not try to be cheap, try to buy a big brand of products.
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