The most intuitively felt by the eyes is light, and reasonable use of light to achieve eye protection requirements. The light of the desk is very directional, and attention must be paid to the safety of the light, such as strobe, brightness, and brightness uniformity.
1. The brightness of the target area to be irradiated should be appropriate. Different eye situations (such as general activities, bedside casual reading, writing and reading) have different requirements for light brightness and uniformity. Users can adjust the position and illumination angle of the light source according to the actual situation to make the target area The light reaches the most comfortable brightness effect. Generally speaking, because the visual brightness of light is more subjective and has large deviations, when adjusting the light, you should resort to brightness monitoring tools such as eye-protection photometers. The safety of light is for long-term, short-distance use of the eyes (such as reading/writing).
2. Avoid the glare of the dazzling lamp cap and the reflection of the illuminated surface. For ordinary indoor lighting (such as roof lights), there are generally no such problems. But for desk lamps, the glare at the lamp cap and the reflection of the illuminated surface are very common. The dazzling glare and reflection have obvious damage to the eyes. The user can avoid the glare of the lamp cap and the reflection of the illuminated surface by adjusting the irradiation position and angle of the lamp cap. Generally, visual inspection can be done.
1. No flicker
Appendix A of the national standard GB/T9473-2017 "Performance Requirements for Reading and Writing Table Lamps" lists the effects of stroboscopic on health. In IEEE Std 1789-2015, it is pointed out that lighting flicker can have the following potential adverse effects: · Photosensitive epilepsy or flicker light-induced seizures; · Stroboscopic effects and related rotating machinery significantly slow down or stop phenomenon; · Migraine or Severe headaches are often accompanied by nausea and visual disturbances; · Increased repetitive behaviors of people with autism; · Vision weakness includes: eye strain, fatigue, blurred vision, as well as traditional headaches and decreased ability in vision-related tasks.
2. No blue light,
The standard for reducing blue light and blue light damage is IEC TR 62778:2014, which is the photobiological safety mentioned in the national standard. Article 5.6 of the national standard GB/T9473-2017 "Performance Requirements for Reading and Writing Table Lamps" clearly requires that the blue light hazard category should not exceed RG0.
3. Color temperature
Article 6.2.2 of the national standard GB/T9473-2017 "Performance Requirements for Reading and Writing Table Lamps" stipulates that LED lamps with a color temperature higher than 4000K should be marked with "It is recommended that the color temperature be adjusted to below 4000K at night". Article 6.2.23 clearly requires LED lamps with a color temperature higher than 4000K to be marked "This lamp is not suitable for use at night".
4. Illumination and illumination uniformity requirements
5. Anti-glare
How to judge whether the desk lamp is anti-glare? First of all, we look directly at the light-emitting surface of the desk lamp. If you feel dazzling, there will be glare problems; if you can see individual light sources, this desk lamp has not only glare problems, but also ghosting. Long-term use will seriously affect vision and reduce the human eye's ability to distinguish details. To detect ghost images, place a magnifying glass under the lamp and a piece of white paper on the ground, adjust the position of the magnifying glass, and observe whether there is one brightness on the paper. If there are bright spots, this lamp must have a ghosting problem. Of course, the safest way is to choose a table lamp with a side light emitting structure of the LED light source. The side-emitting structure has no glare, does not dazzle the eyes and does not hurt the eyes.
6. The national standard for electrical characteristics has many regulations on electrical safety. We recommend the use of DC-powered desk lamps. The table lamp is a mobile lamp, and children can use it in a moving position. Use a DC-powered table lamp to avoid the risk of electric shock for children.
