1. Blue light has the greatest impact on human biological rhythms

In ancient times, people worked at sunrise and rested at sunset. As a result of long-term biological evolution, the changes in natural light are closely related to the rhythm of the human body clock. The average human circadian rhythm is 24.25 hours long, but everyone is slightly different. In general, "night owls" have a longer circadian rate, while "early bird" types have a circadian rhythm of less than 24 hours. As early as 1981, Dr. Charles Czeisler of Harvard Medical School showed that it is sunlight that aligns one's biological clock with the environment.

Everyone knows that natural sunlight can be decomposed into seven colors of light, of which blue light has the greatest impact on human biological rhythms. According to a study published by Harvard Medical School, blue light is beneficial during the day, improving concentration, shortening reaction times, and boosting mood, but it is most damaging at night. Modern cities generally use artificial light sources for lighting. Blue light, as a kind of color light, often exists in various lamps, and the light source excited by a strong electron flow contains abnormally high-energy short-wave blue light, compact fluorescent lamps (commonly known as energy-saving lamps) and LED lamps. That's far more blue light than old-fashioned incandescent lamps. Especially for LED lamps, most LED lamps emit blue light through the chip to excite yellow phosphors to form white light, so the blue light problem of LEDs is particularly prominent. Moreover, most of the current popular electronic products use LED as the background light source, such as computer display screens, mobile phones, tablet computers, flat-panel TVs and so on. With such frequent exposure to blue light, people cannot help but be alert to its hazards.

2. Night light leads to increased health risks

Light of any color can suppress the secretion of melatonin, the hormone that affects the circadian rhythm. Night light is also part of the reason why many people lack sleep, which increases the risk of depression, diabetes and cardiovascular disease. Blue light has the greatest impact of all light. Harvard researchers have done an experiment to compare the effects of exposure to blue and green light of the same brightness for 6.5 hours on biological rhythms. The rhythm was delayed by 3 hours, while the rhythm produced by the same brightness of green light was delayed by 1.5 hours.

In another study on blue light, researchers at the University of Toronto compared melatonin levels in people wearing blue-light blocking glasses in a bright room with those in a dark room without glasses, and found that hormone levels in both groups The levels were comparable, indicating that blue light can effectively inhibit the secretion of melatonin. On the other hand, if people who work night shifts or people who like to stay up late can wear blue light blocking glasses, it will help maintain a stable biological rhythm.

Numerous scientific studies have linked night work and nighttime light exposure to several cancers (eg, breast, prostate), diabetes, heart disease, and obesity. Although it is not entirely clear why exposure to light at night has such a large health impact on the human body, scientific experiments have shown that lower melatonin levels may be associated with an increased risk of cancer. One of the reasons for low melatonin levels is excessive light, especially blue light. Many people now use their phones or tablets for a while before going to bed. Even with the lights in the bedroom turned off, the dim background light of the phone or tablet can interfere with the secretion of melatonin. Dr. Stephen Lockley, a sleep researcher at Harvard, points out that very low levels of brightness can make a difference.

3. Excessive blue light damages the retina

Blue light can reach the retina through the cornea and lens of the human eye, and experimental studies have shown that excessive exposure to blue light can damage retinal photoreceptors, causing retinal changes similar to macular degeneration, leading to permanent vision loss. Although current scientific research has not pinpointed exactly how much blue light is considered "excessive," eye experts worry that regular use of computers, cell phones and other digital devices increases the risk of retinopathy in people's eyes.

On the other hand, because of its short wavelength, high-energy blue light scatters more easily than other visible light and is not easy to focus. When you look at computer screens and other digital devices, the large amount of blue light emitted by the screen acts like a "noise", reducing visual contrast and causing eye strain. Research has shown that blue light blocking glasses that block blue light with wavelengths less than 450 nanometers can significantly increase contrast. So "computer glasses" with yellow lenses increase eye comfort when you're looking at a screen for extended periods of time.

To create a competitive LED industrial lighting enterprise

In recent years, due to the active demand for replacement of LED lamps in various countries and the support of relevant government subsidies in recent years, LED industrial lighting has grown rapidly, and industrial lighting companies have flourished. The market demand for LED industrial lighting products has gradually increased, and the engineering market has maintained steady growth. Under the fierce competition, industrial lighting companies must continuously enhance their core competitiveness and become irreplaceable brands in order to successfully win the market.