Outdoor headlights are getting brighter and brighter, and this damage is increasing.
Therefore, the progress of technology is not necessarily all benefits.
Produced above the snow line
#头灯
In the discussion of the Snow Line fan base, there are two examples of what really happened:
A mountain friend's eyes entered a foreign body, and after the colleague used a strong flashlight to light the treatment, he lost consciousness and fell directly to the ground;
Another mountain friend in order to test whether the headlamp has electricity, did not pay attention to the light facing the eyes, the moment it was turned on, "almost blind, headache for half a day."
Outdoor headlamps and flashlights are increasingly needing attention to the use of this "flashing blindness". Here's why:
The outdoors itself is an environment that is prone to "flashing blindness"
In addition to the two examples described above, recall other outdoor scenes: when the outdoor headlamp is worn on the head during night travel, it is easy to shoot each other in the eye when teammates talk; the camp is crowded and it is easy to be swept by flashlights.
This seems to bring only temporary eye discomfort, but if the road section is steep and the protective measures are not in place at the time of the incident, there is a possibility of causing "secondary disasters" such as falling off cliffs, and there is a possibility of causing eye diseases, so mountain friends still have to take this article seriously.
Outdoor headlamps/flashlights illuminate the eyes, why is it uncomfortable?
Outdoor headlamps/flashlights are led beads. As an outdoor lighting tool, why does it become more and more dazzling, and even cause dizziness and headaches? The former still has a clear answer, and the latter we can only try to give some answers in the conclusions and hypotheses of relevant scientific experiments.
Getting brighter and brighter, leading to glare - in recent years, the mainstream headlamp products launched by outdoor manufacturers are in 300 to 700 lumens, the brightest can reach 1500 lumens, and the flashlight is more than 3000 lumens, or even more than 10000 lumens (this brightness has exceeded some car headlights). This can easily cause glare and make people feel dazzling:
LED lighting products in order to pursue high brightness, high light efficiency, often produce more bright white light... Because short-wavelength light has a relatively high energy, when encountering small particles in the air, the random rate is higher, which is the main cause of glare. (Source: Zhejiang University Press, Photobiological Safety Requirements and Testing)
This is a 10,000 lumen flashlight
This is a 100,000 lumens flashlight
Interference with the human central nervous system - many urban construction experts believe that neon lights, LED screens and other "too dazzling light will interfere with the human brain central nervous system, making people dizzy", such an explanation can also be applied to outdoor headlamps.
It is also not excluded that some people are more sensitive to light, so they are more prone to dizziness and headaches.
Flower world is prone to dizziness
Migraine sufferers are more photophobic – this glare is even less friendly to good friends who already have migraines: it can lure or exacerbate migraines.
In the experimental report of Harvard neuroscientist Rami Burstein, only green light can relieve migraines, while blue light can best aggravate migraines.
This brings us to the hidden hazard of outdoor headlamps/flashlights: blue light hazards.
Blue light hazards
If you pay attention to children's desk lamps, this word should be no stranger. In fact, blue light is everywhere, such as sunlight, car lights, mobile phones, neon lights... But it is not that there is blue light that is harmful, but that the retina may cause damage.
What is Blue Light? Blue light does not refer to blue light, but high-energy visible light with a wavelength of 400 to 500um. It is able to penetrate the lens directly into the retina, causing lesions in the macula of the retina, which can cause irreversible visual impairment.
In the spectrum of visible light, blue light carries higher energy than yellow light... Blue light is 10 times more capable of killing active cells in the human eye than green light. (Source: Zhejiang University Press, Photobiological Safety Requirements and Testing)
Visible light spectrum
The brighter the lamp, the more blue light components - THE LED has "two wavelengths", that is, after excitation of YAG yellow phosphor through the blue LED chip, the hybrid complementary white light is realized, and there are also "three wavelengths", that is, the inorganic ultraviolet light wafer plus red, blue, green three color phosphors are mixed to produce white light.
Whether it is two wavelengths or three wavelengths, it is inseparable from blue light. And in order to get white light with high brightness and high color temperature, it is necessary to save more energy (blue light).
The brighter the light, the more you have to avoid the eyes
LED lamps are basically packaged with convex lenses, and outdoor headlamps are no exception. Therefore, the brighter it is, the stronger the light emitted per unit area, the more severe the blue light damage, and the direct viewing light source is likely to bring harm to the eyes.
So, do these things
"People can't look directly at the sun", and in the same way, mountain friends are increasingly unable to look directly at the current outdoor headlamps and flashlights. Outdoors, you need to pay attention to these aspects:
Be careful to avoid other people's eyes – this is also a kind of mountain etiquette: when illuminating the mountain, remember that the light of the headlamp should hit the ground, not on the face of others; when exploring the road, first make sure that no one is standing opposite you in front of you; when enjoying the camp, do not take a headlamp or flashlight to look around.
Activate red mode if necessary – buy a headlamp with red mode. When teammates gather, rest in a tent, or check your eyes as you do at the beginning of the article, turn on the red light mode, it is not easy to "flash blind" and save power.
Write at the end
In addition to outdoor headlamps and flashlights, laser pointers, welding lights, camera flashes, and strong sunlight can also cause damage to the eyes, especially children (there have been cases of bath masters causing infant blindness).
Have you ever been "blinded"?
Welcome to leave a message below.