I had an eye protection lamp when I was very young. At that time, the children around me were using ordinary desk lamps. So you see: whether it is eye protection or not, desk lamps are always necessary.
Because the lights in our room are often behind us, and when we are at our desks, it just blocks the light behind us. The desktop that needs brightness the most is the darkest. Therefore, we need to put a light in front of us to illuminate the desktop.
Then why use eye protection lights? Fluorescent lamps were commonly used back then, and the purpose of buying eye protection lamps was to increase brightness. The fluorescent lights at that time were too dark. Although several years have passed, I can still recall the dazzling feeling of looking directly at my eye protection lamp.
Now buy eye protection lights, not just to improve brightness. For example, the luminescent bodies of are mostly LEDs, which are more harmful to the eyes than fluorescent lamps. Therefore, it is even more necessary to buy eye protection lamps now.
Then how should you choose LED eye protection light? What should you pay attention to when buying? Any search online will be a few hundred yuan in products. But don’t worry, according to my method, you can also find treasure products within 100 yuan.
When buying a lamp, focus on the following parameters.
can see clearly: Color rendering index
When buying meat, it looks fresh at the meat stall, but it turns white when you buy it. When I bought clothes, I looked pretty good in the store. When I took them out of the mall, I found that there were defects in the color.
These are all because these merchants have installed lamps with low color rendering index. The lower the color rendering index of the lamp, the worse our ability to distinguish colors under the light. To put it bluntly, it is impossible to see clearly. It’s light that makes you unable to see clearly and has nothing to do with your eyes.
The color rendering index of ordinary LED lights in our home is generally 90. But if it is a desk lamp or eye protection lamp, recommends choosing with a color rendering index above 95 - especially for students studying art, you must choose a high-responsive lamp.
see all: illuminance level
A flashlight will produce a light spot on the photo wall. The further the distance between the flashlight and the wall, the greater the radius of the spot and the lower the brightness.
The relationship between light source and distance and brightness is illuminance. This parameter sounds complicated, but fortunately, we have a national standard - Article 5.8.2 of the national standard "GB/T 9473", which stipulates the illuminance of the eye protection lamp.
National standard divides the illuminance of eye protection lamps into A and AA levels, the latter has higher standards. Therefore, when choosing eye protection lamps in , you should try to identify AA grades.
AA grade standard is: distance 300mm, brightness ≥500lx; distance 500mm, brightness ≥300lx.
A grade standard is: distance 300mm, brightness ≥250lx; distance 500mm, brightness ≥150lx.
It feels comfortable to see: Blu-ray , strobe
I wonder if you have noticed that since the LED light source was replaced, our eyes seem to be more prone to fatigue. This is actually related to LED light emitters: the white light emitted by the
LED lamp is generated by the blue light chip to excite the yellow phosphor. Therefore, compared with fluorescent lights that also emit white light, LED lights emit more blue light.
Then can it be made into LED white light that does not produce blue light? Yes, but the cost is very high. So the ordinary LED lights in our home will have blue light. At this time, the preciousness of LED eye protection lamps is even more obvious.
When buying eye protection lamps, you need to pay attention to its blue light parameters - the blue light standard for LED lamps is "IET/TR 62778", among which the level of no blue light is RG0.
In addition, LED light is also a DC light source. It needs to rectify the alternating current in our home and turn it into direct current . However, the process of rectifying in is not stable, the current is too high and too low, and the LED light will flash.
Because of the fast flickering speed, we may not be able to see it. But not seeing it does not mean that there is nothing. The eyes will still remind us through fatigue that it has been hurt.
So how to solve the strobe problem of LED lights? The answer is to make it flash faster. Put it on the eye protection lamp, this parameter is called "flashing frequency".
Generally speaking, if the flicker frequency is above 1250Hz (1250 flashes per second), the damage to the eyes will be reduced. You can mark "no video flash" on the product . A better eye protection lamp can make this value above 3000Hz, which will cause even less damage to the eyes.
Focus on seeing: color temperature, noise
If you are used by adults, just choose the method here. But if the child buys it to study, you need to pay attention to two more parameters: color temperature and noise.
The color temperature of light is directly related to the excitement of people -
The higher the color temperature, the whiter the light will be, and the more excited people will be in this light; otherwise, it will promote sleep.
The lamps in our home are generally 3000K (or 3500K) and 5000K. The living room is generally 5000K, and the bedroom is generally 3000K. But neither of these color temperatures is suitable for learning.
should maintain appropriate excitement when learning, but not too excited. Therefore, it is recommended to choose 4000K for the color temperature of eye protection lamp.
The noise of the lamp is mainly generated by the starter. In fact, all LED lights have noise, and there are also ceiling lights in our homes, but the distance is far away and you can't hear it. But the desk lamp is right in my ears, and the noise is very obvious - especially when it is late at night. The noise of
eye protection lamps still has a national standard: it cannot exceed 25 decibels. If it is used by children, recommends choosing products below 20.
[Some pictures in this article are from the Internet]
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