To measure a qualified desk lamp, the most important thing is to choose an "eye protection" one, which must meet the following requirements:
1. Low blue light
p>In 2010, at the American Congress of Ophthalmology (ARVO), Dr. Danny announced the surprising findings of ophthalmologists: most lighting lights on the market contain "blue light" that is extremely harmful to the eyeballs. Reading below can lead to myopia, computer syndrome, cataracts and even blindness! Doctors remind: "Blue light" is more serious damage to children's eyeballs!
What is Blu-ray?
Blue light (HEV) is a high-energy visible light that can directly penetrate the cornea and lens, reach the macular area, accelerate the oxidation of cells in the macular area, and cause photochemical damage to the retina. Blue light (HEV) has harmful effects on the retina of children. The damage is more serious, and blue light (HEV) is everywhere and exists in large quantities in daily life. The sun, fluorescent tubes, computers, and LCD monitors all contain blue light (HEV). Therefore, blue light (HEV) has been confirmed by research to be the most harmful Hazardous visible light.
If you are worried about the problem of "excessive blue light" in the LED lights or other electrical appliances you purchase, you can follow the "National Standard of the People's Republic of China GB/T 20145-2006/CIE S 009/E": 2002 (Photobiological Safety of Lamps and Lamp Systems)" to determine whether the blue light of LED lamps is excessive - this standard gives an upper limit for the luminous flux of blue light at a specific spatial angle. Generally speaking, blue light exceeding 0.2 is considered high blue light.
So when buying a desk lamp, you must choose a desk lamp with low blue light.
2. No flicker
Strobe is extremely easy to cause visual fatigue, dizziness, eye discomfort and other symptoms. In severe cases, it may cause headaches, vision loss and other problems.
The most direct way to check whether there is stroboscopic is to turn on the mobile phone camera and point it at the desk light source. If there is no flashing dark line on the screen of the mobile phone, it means there is no stroboscopic. The dark line flows smoothly, so the stroboscopic is higher. serious.
3. Soft light
What is soft light? On weekdays, the color temperature of the sunlight we see is about 5600K, which is about the same as direct sunlight at noon. However, for desktop reading, the color temperature is higher and whiter, so the eyes are easily tired.
The best light is 1-2 hours after sunrise, with a color temperature of around 4000-5000K. The light in this color temperature range is comfortable and soft, making it suitable for reading and writing. Generally speaking, if you want to choose a slightly higher color temperature within this range for reading, you need to choose a relatively lower color temperature for writing.
4. Illuminance and lighting range
Testing of desk lamp illumination intensity: The optimal visual light environment is when the illumination at a height of 400mm from the center of the light source to the reading and writing desktop is 750-1500 Lx. Generally speaking, purely in terms of illumination value, desk lamps with less than 500LX are unqualified. Their low lighting brightness cannot be used as reading and writing lighting.
The lighting range is what we usually call the area illuminated by the light of the desk lamp. The illumination range of an ordinary desk lamp is generally about 55cm, which is about the size of a magazine. This is far from enough for students to read or write. If the irradiation range is too low, it may lead to incorrect sitting posture, hunchback, myopia and other problems.
Generally speaking, in order to create a good and comfortable lighting environment for reading and writing, the illumination range of the desk lamp should not be less than the size of two books. This can ensure that people read and write at the most comfortable height.
From an ergonomic point of view, the light from the ring light source is most suitable for reading, and the 16:9 light source distribution design is most suitable for the visual ratio of the human eye.
5. 3C certification
National certification requirements: Study desk lamps must pass the national compulsory 3C certification and be within the validity period.
Children are our future, and we must learn to be rational when caring for our children. In fact, every child is born with a blank slate. The environment you create for him and the things you use for him will affect him in a subtle way. Please don’t cause pain to your child’s growth because of our little negligence.