Author: Shi Wuxiu
Source: Zhihu
The following are the main considerations when choosing a study desk lamp. Regardless of whether LED light sources are used, the more the following standards are met The lamp, the more I think it is a good desk lamp: 1. National certification requirements: the study desk lamp must pass the national compulsory 3C certification and be within the validity period; 2. Use warm white light source: color temperature 3200-3400K, from the perspective of visual physiology, warm white The light source best meets the physiological visual needs of the human eye; 3. Intuitive desk lamp: the light must not be directed at or refract the eyes, and glare must be strictly eliminated. The simple test method is as follows: when the height of the eye from the reading and writing desktop is 400mm, and the horizontal distance from the center of the desk lamp source is 600mm, no direct or refracted light in the desk lamp shade should be visible; 4. Desktop lamp illumination intensity detection: reading from the center distance of the light source The optimal visual light environment is when the illumination at a height of 400mm on the writing table is 750-1000 Lx; 5. Simple test of clarity and color reproduction: Stretch out your palm, palm upward, and place it 30 cm under the light of a desk lamp. If observed, If the lines on the palm are clear and the fingers on the palm are rosy, it means that the desk lamp has clear colors and good color reproduction; otherwise, if it is blurry, dark yellow or gray in color, the desk lamp has poor lighting. The clarity of desk lamps with a color rendering index Ra above 90 is much higher than that of ordinary color rendering desk lamps with a share of above 95 on the market. 6. Selection of light source power: Some data claim that LED desk lamps are most suitable when their brightness is equivalent to that of 25-40 watt incandescent desk lamps, but this is actually not appropriate. After actual measurement, when the center of the light source is 400mm away from the reading and writing desktop, the illuminance of the 25-watt incandescent lamp is only 220Lx, and the illuminance of the 40-watt incandescent lamp is only 350Lx; even when the height is reduced to 300 mm, the illuminance of the 25-watt incandescent lamp is only 330Lx. The 40-watt incandescent lamp is 550Lx, which does not meet the minimum standard of 750Lx for the best visual light environment. 7. The study lamp should be of a certain height. At this time, the light illumination surface is large and the illumination is uniform. The illumination at a distance of 40 cm from the desktop should not be less than 750 Lx. The desk lamp bracket should also be of a certain length, easy to stretch and shrink, and suitable for computers. Multi-purpose use for operation, drawing, calligraphy, and learning to play the piano. The fact is that it is a bit difficult to find an LED desk lamp on the market that meets all the above requirements. Therefore, many customers can only spend more than ten cents more on electricity bills every day, choosing high-definition halogen professional reading desk lamps around 3200-3400K to meet optical parameters and eye hygiene requirements. The visual lighting environment for reading and writing homework at home is very important. The most important thing for reading and writing homework at home is to learn the visual lighting environment, specifically the quality of desk lamps. There are many varieties of study desk lamps on the market, including eye protection lamps, energy-saving lamps, incandescent lamps, and LED lamps. Distinguish the quality of the study lamp. If the light color is white and dazzling, or the light color is dim and the illumination is irregular, it is not suitable to be used as a home study light source, because it will have a negative impact on the development of the eyesight. We look forward to more professional LED reading lamps with high color rendering, warm white tone, high light efficiency, and affordable price being introduced to the market, providing everyone with a clear and environmentally friendly learning visual lighting environment, reducing eye fatigue, alleviating ciliary muscle spasm, and conducive to protecting the eyes. Everyone’s vision develops healthily.