Among the 14 unqualified lamps announced by the Beijing Municipal Administration of Industry and Commerce, “eye protection lamps†and “eye protection lamps†accounted for nearly one-third. The reporter learned that many businesses have claimed that "high-frequency flash" or even "no stroboscopic" can protect eyesight, and even some businesses claim that the product is "DC power supply is more healthy." It is also pointed out that eye protection lamps are only conceptual products. In the end, is there any product that achieves the role of “eye protection� Experts say that stroboscopic lighting is not classified as an indicator of eye protection, and the “shading performance†in national standards is the “eye protection†of lamps. "key.
Strobe is not included in the table lamp indicator requirements
The concept of "eye-protection lamp" has a long history. Many merchants use the words "high-frequency flash" and "no stroboscopic" to express their own lamps, not only "eyes", but also protect eyesight and even "prevent myopia". ". In recent years, some merchants have said that their own lamps belong to “DC power supplyâ€, which is healthier than the previous “AC power supply lampsâ€. Is this really the case?
Yang Zheng introduced that "DC power supply" if it is clear that the current of the lamp is working in pure DC mode, the light emitted by the light source will also be in the form of DC (small fluctuations or pulsations superimposed on the DC basis), from the physical In perspective, the volatility of its luminescence is indeed much lower than the volatility of the illuminating light source operating with alternating current. At present, the desk lamp using the LED light source module belongs to this type, but the input power supply is still in the form of communication.
However, Yang Zheng explained that in fact, "the sensitive frequency of the human eye to light fluctuations is in the low frequency range", such as the frequency of warning lights such as ambulances is about 8-10 Hz, which is most likely to cause discomfort and cause everyone to be alert. These frequencies are much lower than the optical frequency range of the source of normal AC power supply operation, so "there is no uncomfortable situation when the normal human eye operates at the current frequency of the civilian power supply." For example, he said that the light source used in a wide range of the world is 50-60 Hz. Since there is no low-frequency eye injury, there is no such thing as high-frequency eye protection.
In addition, the reporter consulted the national standard "Performance Requirements for Reading and Writing Table Lamps" as the national standard for "table lamps for use in reading and writing lighting places like homes, classrooms, etc.", and the standard did not mention the so-called stroboscopic problem. According to the reporter, in the draft of the standard, the foreword has mentioned that “currently, high-frequency scintillation (greater than the flicker of the fusion frequency) affects the work of visual research. It is not certain that the retinal nerve is caused by high-frequency light stimulation. The response affects the visual function of any sensory or motor nerve, so this standard does not include flicker in the technical requirements of the desk lamp."
Two factors determine whether the lamp protects the eye or not
The so-called "eye-protection lamps" are mostly ordinary table lamps. The reporter learned that the national standard "Performance Requirements for Reading and Writing Table Lamps" stipulates the table lamps from the eye-related project indicators, for example, stipulates the color characteristics requirements and color rendering index requirements of the light source (5.7.2), noise requirements. (5.10) and so on.
The standard also stipulates the opacity requirements of the luminaire (5.8.1, that is, “the height of the eye from the reading and writing table is 400mm, and the horizontal distance from the center of the light source is 600mm, and the inner wall of the reflector and the light source should not be visibleâ€. Yang Zheng explained that the luminous surface can not be projected into the human eye retina, this is the real eye protection requirement of the desk lamp.
Another item related to “eye protection†is “illuminance requirement†(5.8.2, which requires that the illumination of the table lamp on the table should be relatively uniform, and the area of ​​the illumination should cover the area of ​​reading and writing, otherwise it will easily cause vision. fatigue.)
Musk Ketone a kind of artificial musk.used for the preparation of flavor.the aroma quality of musk xylene is elegant, is used as a fixative; modulation of cosmetics, soap flavor; also with methyl violet copper, cinnamic alcohol, benzyl salicylate and other spices to make the powder flavor.
Ketone Musk,Saudi Arabia Musk,Free Sample Musk,25Kg Drum Musk
Gan Su Original Flavor Co.,ltd , http://www.muskxylol.nl