How good is the color temperature of the student eye protection desk lamp? If the brightness of the desk lamp is not enough and the illumination is uneven, it is very easy to cause children's myopia, so to choose a good desk lamp, the color temperature of the desk lamp is a very important indicator. Share with you how good the color temperature of the student eye protection desk lamp is.
How good is the color temperature of the student eye protection desk lamp? 1 1. The color temperature of the study and reading lamp should not exceed 4000K K. 4000K is the color temperature of sunlight around 9 am. 8 o'clock to 10 is one of the most efficient working hours in a day. Choosing 4000K natural color is also in line with the law of human biological clock.
2. Student desk lamps are generally used at night, and cold light can help children concentrate and improve efficiency. However, cold light will affect melatonin secretion and affect children's sleep quality. Yellow light helps sleep, but most parents don't want their children to fall asleep while doing homework. 4000K is the color temperature of the student desk lamp that gives consideration to health and learning efficiency.
3. Let's see how the national standard specifies the color temperature.
The national standard "performance requirements for reading and writing desk lamps" stipulates: "For LED lamps with color temperature higher than 4000K, it is recommended to adjust the color temperature below 4000K at night". For dimming lamps, LED lamps with color temperature higher than 4000K are clearly required to be marked "This lamp is not suitable for night use".
Although the national standard does not stipulate the color temperature range of reading and writing desk lamps, don't forget the fact that children use desk lamps at night!
A good LED eye protection desk lamp should meet several requirements:
Color temperature must be natural light color temperature 4000 k;
Color rendering above 95RA, pass, above 97RA is excellent;
Eye protection desk lamps must be dimmed to meet the needs of different scenes;
The luminous flux of eye protection desk lamp must be greater than 600, preferably 700. The full illumination under the lamp must be above 1000Lux. Don't say anything about A-level and B-level lighting, it's all nonsense, as much as you want! The change of illumination within 40 cm before and after shall not exceed 40%, and the uniformity must be good;
Eye protection desk lamp can't shine directly, glare is too big, eyes are too tired, so use light guide plate to shine sideways. After diffusion and reflection, it reaches the working face, removing glare to the greatest extent, making the light on the working face uniform and soft, and ensuring that the eyes are not tired or dizzy;
The main structure of aluminum alloy can be adjusted in many dimensions, especially in the axial direction, which can adapt to the needs of different scenes;
The eye protection desk lamp cannot be directly powered by 220V mains, and it must be within 36 V, which is generally 12-24 V desktop working voltage. There is no stroboscopic light source and no high voltage all over the body, so as to avoid the danger of electric shock.
What is the color temperature of the student eye protection desk lamp? What light source is good for 2-eye desk lamp?
1, the brightness stability of light is good, and there is no rapid change of light and shade (that is, stroboscopic) that can be perceived by human eyes.
2, the color temperature is about 4000 ~ 4600 K, the color temperature is moderate, and the light is soft and yellowish, which is more suitable for reading needs; The color temperature is about 4700 ~ 5500 K, with high color temperature and dazzling white light. At dusk, the color temperature of sunlight is 2000K-3000K, which is too low and yellow. At noon, the color temperature of sunlight is close to 7000K, which is too high, too bright and too dazzling.
3. It is scattered light, with large illumination area and no shadow with strong contrast.
4. spectral continuity: mixed light composed of a variety of visible light in a certain proportion, not monochromatic light.
The direct sunlight and natural light of the window are usually very strong, so it is not suitable to read and write for a long time in this light.
What are the advantages and disadvantages of each generation of light sources?
First generation light source: incandescent lamp
No blue light, high-frequency flash, no radiation, tungsten filament glow, less pollution and high power consumption.
Second generation light source: traditional fluorescent lamp
No blue light, high-frequency flash, serious radiation and mercury pollution, high-frequency ballast.
The Third Generation Light Source: High Frequency Fluorescent Lamp
Alternating current lamp without blue light, low frequency flash, radiation, high frequency electronic ballast and alternating current lighting. Stroboscopic light will also cause damage to the cornea and iris of human eyes, which will cause fatigue and vision loss, and also make people dizzy and other similar neurasthenia symptoms.
The fourth generation light source: LED eye protection desk lamp
There is blue light (unique to led), no stroboscopic, no radiation, rich lighting products, low energy consumption, mainly used for large-scale landscape lighting. Its eye protection effect is to use the adapter to output low-voltage DC, basically no stroboscopic, which can make the color temperature range of light wider. The disadvantage is that the color spectrum of light is too narrow and the blue light component is too strong, which is easy to cause irreversible eye diseases and is not suitable for high-eye environment.
The fifth generation light source: DC eye protection lamp
No blue light, no stroboscopic light, no radiation, high price, low intensity, single product, mature DC technology, using DC ballast to convert output DC to light DC lamp, the lighting area is generally large, and it can be applied to high-eye environment.
How good is the color temperature of the student eye protection desk lamp? Which is better, white light or yellow light?
White light is too strong, reading and writing in this light will have a reflective or dazzling feeling, resulting in visual fatigue and decreased vision, so whether it is eye protection or other lighting, it is best to choose yellow light.
Reading and writing in yellow light will make you feel soft and comfortable, while reading in white light will make your eyes ache for a long time. Create a good learning environment and ensure adequate lighting. The light should come from the upper left, and the distance between the desk lamp and the desk should be 50 to 60 cm.
What eye protection does children's desk lamp use?
The desk lamps used by students in the market are all under the banner of eye protection, but the quality of the desk lamps is uneven and the price difference is quite large. Parents are confused. Some parents are desperate to protect their children's eyesight, 1000 have to give up their love. Is it necessary? Too cheap or poor workmanship, unreasonable circuit design leads to the rapid shortening of desk lamp life, and some technologies are not in place to protect eyes; Too expensive is generally because some merchants add some impractical functions to the desk lamp in order to sell it at a higher price, so when buying it, you should also think clearly about what is the most important desk lamp for students.
The staff who have been engaged in professional eye protection for many years generally recommend it. According to the cost accounting, the general price is above 300 to 400. Of course, the choice of eye protection and desk lamp is very important, but it is also important to cultivate correct reading and writing habits. It is also important to encourage children to go outdoors more, have a balanced nutrition and eat less sweets and cold drinks … these are also important to protect their eyes.