Yu Anqi: for different occasions to determine the security of LED

The lighting of LED, its spectrum is mainly concentrated in the visible region, almost no ultraviolet and infrared radiation components, international Photobiological Safety Standard IEC/EN 62471 standard for LED lighting, mainly related to the harm of light radiation intensity (including blue radiation). LED light source at this point is still very advantageous, it is relatively simple biological safety protection. LED each light source generated by radiation amount is not large, far less than the HID (high intensity gas discharge light source), but it can be very small energy concentrated in a certain direction, although unlike the strong laser, but also harm the local intensity should pay special attention to. In fact, the application of different light sources to different places, you can play a part of the protection. For example, high pressure sodium lamp used in the street, square lighting, the location of the high degree of light is not harmful.

At present, LED used as garden lights, tunnel lights, and used in commercial lighting, office lighting and other indoor places, are very desirable. With the progress of LED technology, the price is reduced, at the same time, the rising price of phosphor on the traditional lighting brings the cost of pressure, these are LED into the field of indoor lighting provides a good opportunity.

However, once in the LED indoor lighting, will its security problem is more prominent, if made of lamp, lamp, flashlight, laser lecture pen, will cause the child's interests, its security becomes more important. For example, a small laser teaching pen, if directly exposed to the child's eyes, it will damage the retina of the child's eyes. LED lighting radiation intensity of the harm is an objective existence, but also the most protective part of the enterprise.

Now the domestic biological safety is the mandatory standards, but has not been seriously implemented, the root cause lies in the detection instrument has not reached a high enough level, that will produce a great deviation between the actual measurement results. China's laboratory accreditation is in line with international standards, but the actual detection capabilities, there is a great difference between the various laboratories. Many laboratories claim to have the capability of the IEC/EN 62471 standard, but many laboratories are not available. Now LED are still in the phase of the sample, the mainstream of the market or the traditional lighting products, but the product LED will soon come round, once the LED into the product stage, IEC/EN 62471 must be mandatory implementation of the relevant testing laboratory must have the ability to match, otherwise harm biological safety may be there will be.

It is very important and difficult to measure the LED radiation intensity. Even if the LED module to meet the requirements, the lamps are not necessarily meet the requirements; lamps should also consider the distribution of light, the direction of maximum intensity is not easy to identify the human eye, we must seriously look for. These are not just domestic issues, but also the bottleneck of international testing in the field. I hope we can walk together and solve the problem at the end of the year, when the correct detection means, and specify a qualified laboratory test, in order to fundamentally ensure the LED not only has good lighting effect, it will also reduce the damage to a minimum.

As for the stroboscopic aspect, the reality does not belong to the contents of the bio safety. However, the strobe is also an issue that companies should be concerned about, especially the exchange of LED, which can be used in some occasions, such as underground garage, walkways, etc.. But if it is the office, fine processing occasions, such as indoor lighting is not desirable, stroboscopic will produce visual fatigue, which is proved by the test.

LED lighting must be designed according to the application, in some cases, the pursuit of longevity and efficiency, in some cases, the pursuit of higher comfort and security. Therefore, enterprises must develop products in terms of light efficiency, life, comfort and other aspects of light, according to the different use of the environment to make a different choice, can not be generalized.