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The global awareness of energy saving and carbon reduction, coupled with the maturity of LED applications, the proportion of LEDs used in lighting products continues to rise, both indoor lighting and outdoor lighting are gradually adopting LED products. With the expansion of LED lighting applications, The health effects of LED light sources have also been widely discussed in the near future, including the direct view of LED blue light on the retinal macula and the effects on melatonin inhibition.
LED light source advantages
LED's high luminous efficiency, long use time, easy recycling and environmentally friendly features make the LED light source become the darling of lighting applications. LED energy conversion efficiency is high, and the service life is longer than that of fluorescent lamps and incandescent lamps. Containing harmful substances such as mercury, it is currently the most environmentally friendly choice of light source. On the other hand, LED light source does not have infrared and ultraviolet light, can avoid tanning problems, and can reduce the high temperature generated by the light source, and the LED response time is fast, the human eye feels Less than the flash of the light source.
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Some academic circles have raised health concerns caused by blue light
However, with the continuous expansion of LED applications and the increasing consumer acceptance of LEDs, the impact of LED light sources on health has been widely discussed. Among them, users have been staring at backlight screens including computers, TVs and mobile phones for a long time. This makes blue LEDs the most concerned about health effects. The blue light in the LED light source has the characteristics of short wavelength, and the blue light wavelength is about 380-495 nm, which is the shortest wavelength but the highest energy in visible light. A study on the light environment biosafety of the classroom light environment by Professor Yan Yonghong of Chongqing University pointed out that After animal experiments, with the increase of blue light intensity, blue light damage the macular damage of the retina. On the other hand, some studies have pointed out that the irradiation of blue light may be the cause of age-related macular degeneration.
Regarding the health effects of blue light, in addition to causing macular damage to the retina, this study also tested whether blue light inhibits melatonin secretion, and compared short-wave blue light with fluorescent light with a color temperature of 4,000k. Blue light will inhibit the secretion of melatonin, and increase the degree of alertness, as well as improve body temperature and heart rhythm. Experts believe that watching TV screens, computer screens and mobile phone screens for a long time may have an impact on the user's eyes and physiological clock.
In addition, the use of different color temperatures of LED light sources will have different effects on health. Generally speaking, the higher the color temperature value, the cooler the color of the light source, the lower the color temperature value, the warmer the color tone, the higher the color temperature makes the user spirit Concentration, but if you use an LED light source with a color temperature of 7,000K, it may accelerate the appearance of burnout. According to the experimental results, the color temperature is too low, such as 2,500K~3,000K, it is easier to make people feel sleepy, in contrast, color temperature 3,500K ~ 5,000K LED light source, some people think that this choice is more moderate.
Energy-saving awareness is high, LED demand is heavy, health and safety are controversial
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