Blue light is a type of electromagnetic radiation that is found throughout the visible spectrum. With the advancement of science and technology and the development of society, electronic products, such as computers and mobile phones, have become necessities in people’s lives. The ubiquitous electronic screen is full of our lives, studies, and work. However, the high-energy light emitted by electronic products is constantly impairing people’s vision health.

So, what is blue light? Maybe it sounds familiar to you, but we are unfamiliar if checking in detail. The light that the human retina can perceive is visible light, and the wavelength range is generally 380-780nm; among them, the wavelength range of 400-490nm is called blue light.

Blue light is ubiquitous in our lives, but in fact, not all blue light can cause eye health hazards.

Because the shorter the wavelength, the higher the energy, and the stronger the penetrating power, so the short-wave light of 415-460nm is more harmful to the human eyes. The world’s famous optical experts also unanimously pointed out that short-wave blue light has extremely high energy and can penetrate the lens directly to the retina.

The harm of short-wave light is mainly reflected in the following aspects. First, it is easy to cause visual fatigue, and it will cause vision loss over time; second, it will cause irreversible damage to the eyes, because the harmful light with high energy can directly penetrate the lens and reach the retina, which does not only affect vision but also causes macular disease and cataracts The effect is more obvious for children who are in the growth stage.

Although short-wave blue light is harmful to the eyes, long-wave blue light has a beneficial side. Blue light is the basic component of white light. The reason why humans can feel the colors and colorful world, long-wave blue light plays a key role. In addition, long-wave light also contributed to the formation of the circadian body clock. Studies have shown that 465-495nm light plays a vital role in circadian rhythm. Since this part of the light can suppress the production of melatonin, adding this part to the daytime spectrum can ensure the efficiency of work, keep people awake and alert, and promote work enthusiasm and concentration. And at night, by reducing the blue light or color temperature to achieve functions such as promoting sleep and adjusting jet lag.

A number of relevant safety standards and reference documents have been introduced as support. Let’s have a brief look at them. IEC / EN 62471: 2006 has established methods for assessing the photobiological safety of luminaires. North American ANSI / IESNA RP-27 establishes photobiological safety-related standards for luminaires and luminaire systems. IEC / TR 62778 specifies issues for the general lighting service luminaire category and provides guidance on the application of blue light hazard classification for LED lighting products.

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