To improve the vision, many city roads, highways and viaducts have been equipped with LED lights. Especially the busy sections of the vehicle, the setting of street lamps greatly reduces the possibility of traffic accidents. Compared with the traditional high-pressure sodium lamps, LED lights with energy saving, light decay, long life, low maintenance costs and many other advantages, but there are unavoidable defects LED lights - Blu-ray hazards.
Blu-ray does not mean blue light, but refers to the wavelength is between 400nm-480nm high-energy short-wave blue light, with high penetration. The wavelength of blue light within the macular region will increase the amount of toxins, light-sensitive cell death, decreased visual acuity, or even induce blindness caused by a serious threat to our eye health. Daily blue light can be seen everywhere, but the proportion is generally within the normal range of health, less impact on vision. However, a large number of blue light in the LED screen, LED lights, fluorescent lamps and other artificial light, long contact will feel "hot eyes", the eyes have difficult to recover damage.
The American Medical Association (AMA) has recently accepted a formal policy statement on street lighting: cold and dark. In its statement, the color temperature should not exceed 3000 Kelvin (K) for nighttime outdoor lighting, especially street lighting. The higher the color temperature, the more white light, which means a higher content of blue light, and white LED bulb color temperature can usually reach 4000K-5000K, containing harmful blue light higher.
White LED street lamp in addition to threatening health, but also easy to affect the driver's vision. Because of the high energy content of blue light, encountered in the air of small particles of high rate of random scattering, driving at night in the field of vision prone to greater brightness changes, causing visual discomfort and loss of clearness glare phenomenon. As with the high beam, the driver's vision and visibility of a very large impact, a little carelessness is likely to lead to traffic accidents.
On the other hand, the daily visible light in the eye focus after the formation of focal distance difference, which is the main reason for the formation of blurred vision, and the injection of blue light will increase the focus distance difference and visual ambiguity, easily lead to visual fatigue, Driver traffic observation and driving attention. White LED at night to suppress the effect of melatonin than traditional high pressure sodium lamp to five times higher. Melatonin suppression means that insomnia and circadian rhythm are disturbed.
If you stare directly at the LED indicator on the home appliance, you will soon feel the blue "hot eyes." As with long-term use of digital products, Blu-ray will cause digital visual fatigue, street lighting will also bring the same impact, driving safety risks.
How to avoid the night driving blue light brought about by the harm? AMA in this latest policy statement encourages the use of color temperature of 3000K or less as a road lighting and other lots of outdoor lighting. All LED lights should be protected, the impact on the human body and the environment to a minimum. It is also recommended to reduce the brightness of the LED lights during off-peak hours.
For the driver, first of all to avoid prolonged fatigue driving, to maintain proper rest time, avoid physical fatigue and visual fatigue. In addition, if the road is often more sections of the road, the best standing a pair of anti-blue light glasses to reduce the damage of the blue light for the eyes.
Improve energy efficiency is imperative, but the bad lighting and glare caused by the physiological rhythm and other personal risks are disrupted, also must be minimized. As long as a reasonable design, I believe LED technology will be able to bring both the optimal solution.