The American Medical Association warns that LED has "poison"? OSRAM Shao Jiaping so look

Daquan news September 25th citing "Washington Post" reports, the American Medical Association issued a new warning: high strength LED lamps (for example, used by the United States of Seattle, Losangeles, New York, Houston city street) will produce a visible blue light, this light may interfere with sleep, or increase the risk of cancer, cardiovascular disease other serious diseases. In addition, the American Medical Association also warned that these LEDs will affect the vision of people driving at night.

My God, this warning but no trivial matter ah, the heart of fear.

"Afraid of a wool? The sky is blue, blue hair harm? "

Let's take a look at LED's Blu ray.

Where is the invisible blue light?

I usually have a habit, that is with scientific issues high on the level of the atmosphere, all start to ask before the scientist Dr. qiu. I am not the exception, results when I Pidianpidian ran, Dr. Hiew just with my eyes glanced at me, out of a "sky is blue, blue light can have what harm?"

The sky is blue, blue light what harm?

My tender and delicate mind blowing shells can be broken after suffering Hiew ruthless abuse, only self comfort. Yes, the sky is blue, blue light what harm ah.

No, what's Blu ray here?

Where is the Blu ray? Look at the picture above. From left to right, followed by ultraviolet, visible and infrared. Among them, the wavelength of visible light is from 400 nm to 700 nm, and from the range of 400 nm to 500 nm, the color of our eyes is blue.

Is there a blue light in LED? A schematic diagram of a LED:

We use the most is the white LED. To make this white light, the first to let the LED chip emit blue light, and then stimulate the phosphor to emit yellow light, two colors of light and then mixed with white light. Specific to the color, if you want to LED a little more white, it will increase the amount of blue light. If you want LED to warm up, lower the amount of blue light.

Two, the harm of blue light?

Since the United States said Blu ray harmful, the United States the use of LED lights how to do it? According to a report last year, the U.S. Department of energy said that at present, nearly 13% of the country's regional / road lighting are using LED lights. Reported that the LED lamp than its replacement of yellow orange high-pressure sodium lamp to save half of the energy, compared with the use of high-pressure sodium lamp 2-5 years, LED lamp life of up to 15-20 years. The American Medical Association's report shows that the U.S. states and cities will be updated to assess the intensity of its installed LED lights.

In fact, not just the United States, in recent years, experts have raised similar concerns. In 2012, the International Electrotechnical Commission into the LED lamp blue light hazards into its safety requirements, so that the blue light hazard has become one of the parameters must be considered.

In the International Electrotechnical Commission (IEC) standards, such as the classification of the level of biological safety standards.

As you can see, this is only for lighting fixtures. And for liquid crystal display, LCD TV and other LED products, and there is no relevant provisions.

In the blue light intensity measurement method and the resulting harm, I was dazzled, all the various data emerge in an endless stream. But this also illustrates a problem, that there is not a universal standard, basic is the village village of merit.

In fact, we want to know is very simple, such as the brightness of the above picture, will damage our retina? I don't know, because there is no standard, and there is no reference. Like many people in the LED industry on Blu ray harm, usually said blue light hazard argument is correct, but not to say that LED will have damage to the human eye, but it is said that the possibility of relatively large.

Baidu in a circle, found that many LED manufacturers have done a description of their products, but may have a certain sameness of meaning, is nothing more than the blue white LED light source is not higher than the content of the same color fluorescent lamp and metal halide lamps and other traditional light source and the sunlight; white LED light source in the retina is blue light irradiation with the fluorescent lamp and metal halide lamp light source is similar to traditional, belong to the 0 class and 1 class safety lighting products etc..

Moreover, it is reported that this year, a new light source and new energy lighting forum, the experts reached a consensus: blue light is the basic component of white light, and the sun and the traditional light source, white LED also contains blue light. A proper amount of blue light is not only necessary to ensure the color rendering performance of the light source, but also to regulate the physiological rhythm of human beings.

One side is to reveal the role of blue light on the medical side, on the one hand is the brightest experts say chest LED harmless. Corresponding to it, it is the poor implementation of various standards or even lack of standards.

Three, industry experts how to see?

I consulted the news of OSRAM's Dr. Shao Jiaping. Dr. Shao believes that a simple and crude comment on the potential hazards of LED spectroscopy is not scientific enough, the lack of evidence. The invisible blue light itself is an error description, the blue light is visible, and the visible near UV spectral component is very small, and the other is the visible 380nm-780nm part of the human eye