LED lights cost electricity and hurt your eyes?
Please stop scolding: these lamps and lanterns, LED really don't blame! Some lamps do have problems such as insufficient brightness, high power consumption, and eye damage, but this is not the fault of the LED, but your lamp is not well chosen.
In fact, there is no need to look for information everywhere to learn how to buy, the national standard has already given us the answer
According to the requirements in this standard, I have summarized the 7 gold indicators for the purchase of top lights.
.01 Luminous Flux
Commonly known as "brightness", this parameter allows brightness to be described in words. The standard requirement is that there are no less than 300 lumens per square meter – 4,500 lumens per 15 square meters of bedroom.
There is also a parameter called "power" for LED lights, which can be compared with the luminous flux: under the premise of the same luminous flux, the lower the power, the more power saving. Inefficient LED lamps produce only 20 lumens per watt, while high-selling lamps produce nearly 200 lumens per watt.
Why do your LED lights cost so much electricity?
Because of the low efficiency, the brightness is not enough. In order to increase the brightness, you have to increase the power, and the higher the power, the more power it consumes.
.02 Illumination uniformity
This parameter is easy to understand, that is, uniformity: some lights are turned on and the light is very uneven, some places are bright and some places are dark. Walking around the room, what the eye feels is "flickering light and dark".
Therefore, the standard stipulates that the illumination uniformity cannot be lower than 0.8 - for lamps, the highest uniformity is 1, and the closer to 1, the better.
In addition to the quality of the lamp beads, the factors affecting the illumination uniformity of the lamp are also related to the lampshade. The surface of the lampshade is pitted, and the light emitted must not be uniform. The most extreme example is the crystal lamp in the picture below, which is so uneven that it produces light spots
.03 color temperature
The higher the color temperature, the whiter, and the lower the yellow. The color temperature specified in the standard is 3300K~5500K, I asked a few friends who have done school lighting projects, and they all said that the color temperature of lights in schools is generally about 5000K.
The color temperature can't be too high, it will make people feel harsh - very surprising, right? It is not too bright to be dazzling, and too high a color temperature can also be dazzling. It can't be too low either, the warm yellow color will make you drowsy.
Color temperature changes in photographic lights
For home users, the color temperature should be used reasonably. Being "drowsy" is not a good thing for students in the classroom, but it is not a bad thing for people who can't sleep.
Therefore, it is recommended to use white light of about 5000K in the living room and yellow light below 4000K in the bedroom.
.04 color rendering index
When we buy clothes in the mall, we often feel that we can't see exactly what color the clothes are. Isn't the lights in the mall bright enough?
The standard stipulates that the color rendering index of the lights in the classroom should not be lower than 90.
Especially for children, the more they can't see clearly, the harder they will look, and after a long time, they will get tired eyes. Therefore, the more colorful the room, the higher the color rendering index. Up to 100, the higher the better.
.05 Harmful blue light
The three primary colors of light are red, green, and blue, and the three colors together are white light. Therefore, "blue light" is a part of visible light, which cannot and cannot be missing, and serious blue light has no effect on the eyes.
The three primary colors of light
The "blue light hurts the eyes" in our colloquial language refers to the blue light with a wavelength between 415nm~455nm, also known as "harmful blue light". LED lights can produce harmful blue light or not, mainly depending on the production process.
The national standard for lamps and lanterns also classifies the blue light level of lights, which is divided into 4 grades:
RG0,RG1,RG2,RG3
- The health level is lowered in turn
In addition, you can also pay attention to a foreign certification: TÜV Rheinland low blue light certification!
Certification mark
If you want to protect your eyes, you must first have RG0, and secondly, it would be better if you had low blue light certification.
.06 glare
The midday sun, the high beams turned on when you meet at night - what does it feel like to stare at them? Not just dazzling, but the whole brain hurts, and the undereyes feel tired, right?
This feeling is called glare, and although the light does not produce such a strong glare, it can also make people feel uncomfortable.
There are many ways to eliminate glare, such as placing lamp beads on the side, making masks refractive with multiple materials, and so on. When purchasing, you can pay attention to one parameter: glare UGR, no more than 19 will not make people feel uncomfortable.
Or there is a simpler and cruder way to judge the glare of lamps: staring directly at the turned on lamp and feeling any discomfort in the head and eyes, that is, there is glare. It's not uncomfortable to stare at for a long time, it's absolutely safe.
.07 can be video flashed
The lights in our house keep flickering, do you believe it? Don't say it, I know you don't believe it - it's because the human eye is so delicate that it ignores the flickering. Turn on the camera mode of the phone and adjust it to 60 frames to shoot the video
The solution to this problem is to increase the frequency of flashing so that people can't see it or feel it. This is called "no video flash":
It's easy to say, but it's complicated to do. In addition to the quality of the lamp, the strobe is also related to the electrical problems in the home.
Fortunately, almost all of today's lamps and lanterns can eliminate video flicker, as long as you look for big brands, you won't go wrong.
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