LED lamp Zaibao "quality door" eye lights "eye"

In 14 unqualified luminaires announced in Beijing Industrial and Commercial Bureau in "eyeprotector lamp" eye "accounted for nearly 1/3. Reporters learned that many businesses have claimed that high frequency flash or even no stroboscopic to protect vision, and even businesses that the product is more healthy DC power supply". It was also pointed out that only the concept of eye care products, in the end there is no product to achieve eye protection role? Experts said that the flash did not return to the eye lamp indicators, while the national standard in the shading performance is the key to protect the eyes of the lamp.

Strobe is not included in the table lamp indicator requirements

Eye protection lamp concept for a long time, many businesses have high frequency flash, no stroboscopic and other words to express their lamps not only do not hurt the eye, but also to protect the vision, and even to prevent myopia". In recent years, there are businesses that own lamps belong to DC power supply, compared to the previous AC power lamps more healthy. Is this really the case?

Yang Zheng said, "if the DC power supply" is clearly the lamp current using pure DC mode, the light emitted by the light source will also be in the form of direct current (DC in the superimposed wave or pulse tiny), from the physical perspective, the volatility of the volatility of the light is far lower than the current the light of the. At present, the LED light source module of the lamp belongs to this type, however, the input power supply is still in the form of AC.

But Yang Zheng explained, in fact, the human eye for the sensitivity of the frequency of light waves in the low frequency range, such as ambulances and other warning light frequency is about 8-10 Hz, the most vulnerable to human eyes, causing everyone's vigilance. These frequencies are much lower than the normal AC power supply of the light source of the optical frequency range, so there is no normal eye in the current civilian power supply frequency when the light source is not comfortable". For example, he said that the current world wide use of light sources are 50-60 Hz frequency. Since there is no low frequency eye injury, there is no high frequency eye protection.

In addition, the reporter access to the national standard "read and write operations" as the "lamp performance requirements, suitable for reading and writing, classroom lighting places similar families and other places of the lamp" GB, the standard did not mention the problem of so-called strobe. According to the reporter, in the standard draft, the preface mentioned that "at present, high frequency flicker (greater than flicker fusion frequency) work influence visual research not sure by the high frequency light stimulus response caused by retinal nerve will affect any perception or movement of the neural visual function, so the requirements of this standard not included in the table lamp will flash technology".

Two factors determine whether or not the lamp eye protection

The so-called "eye protection lamp" is the ordinary table lamp. Reporters learned that the national standard "read and write operations on the table lamp performance requirements" to make provisions, from the project index with the eye on for example: the provisions of the requirements and the color of light source color index requirements (5.7.2), noise (5.10) etc..

The standard also provides for the shading requirements of the lamp (5.8.1), that is, the height of the eye to read and write the desktop 400mm, from the level of the light source to the center of the distance from the 600mm to look at the lamp, the reflector should not see the wall and light source". Yang Zheng explained that the light-emitting surface can not be projected onto the retina of the human eye, this is the real eye protection requirements of the lamp.

Another with the "eye" is the "light" (5.8.2, the standard requirements of the lamp on the desktop lighting should be uniform, and the lighting area should cover the read and write operations of the area, otherwise easy to cause visual fatigue. )