Many people have consulted us about the issue of LEDs in the end. Since I have been rooted in the lighting business since the beginning of the university, many people ask directly for the child's vision and health. As far as I can buy a table lamp that I often buy from the market: the table lamp for non-learning reading, from the perspective of energy saving, LEDs certainly don't have to say, but if it is a desk lamp chosen for long-term reading and learning, from the judgment of the comprehensive health lighting index, if it is not made, if you want to buy a perfect, you really have to spend a lot of effort and money. Just like after the light source revolution, the old generation of light source products will not be completely eliminated because of some special excellent parameters. At present, LEDs as a desk lamp source will not win all non-LED sources.
LED table lamps are overwhelming in the market, but the quality is still uneven. A common problem is that because many of these lamps use low-power LEDs as light sources, their total power is insufficient to achieve sufficient illumination. It has no effect on eye hygiene, depending on its function. If it is used as a bedside lamp or a night light, the control requirements are not high, and the impact may be small. However, if used as a reading lamp, insufficient illumination will accelerate visual fatigue and is not conducive to protecting vision.
Secondly, the white LEDs used in most LED lamps are based on the principle that the blue chip is coated with phosphor, the blue light of the chip excites the phosphor to emit yellow-green light, and the yellow-green light and blue light are combined. Because of the lack of red light, the color temperature It is too high, and some far exceeds the appropriate color temperature range for indoor lighting. Of course, the damage of the LED blue spectrum to the eyes when the table lamp is used at a close distance also needs to be protected!
In addition, due to the small size and high brightness of the LED light source, the anti-glare measures for the LED desk lamp are also relatively high. If you do not carefully choose the angle of light, take anti-glare measures such as grille, lens, etc., it may produce direct glare, which not only produces glare, but also reduces visual function, which is not conducive to reading.
I mainly choose the following books, whether or not I choose LED light source, the more lights below the standard, the more I think it is a good table lamp:
1. National certification requirements: Learning lamps must pass the national mandatory 3C certification, and within the validity period;
2, using a warm white light source: color temperature 3200-3400K, from the visual physiology, warm white light source most in line with the human eye visual physiology needs;
3, intuitive table lamp: light can not directly or refract the eyes, strictly eliminate glare. The simple test method is as follows: when the height of the eye is 400mm from the reading and writing tabletop and the horizontal distance from the center of the desk lamp source is 600mm, the direct or refracted light in the lampshade should not be visible;
4, table lamp light intensity detection: the center of the light source from the reading and writing table height of 400mm illuminance at 750-1000 Lx is the best visual light environment;
5, simple test of clarity and color reproduction: stretch out the palm, palm up, placed 30 cm under the lamp light, if you observe the palm line is clear, palm fingers ruddy, the table light color is clear, color reproduction is good On the contrary, the blur is unclear, the color is dark yellow, and the gray light is poor. The brightness of table lamps with a color rendering index Ra of 90 or higher is much higher than that of ordinary color table lamps with a market share of more than 95%.
6. Selection of light source power: Some data claim that the LED desk lamp is most suitable when it is equivalent to the brightness of a 25-40 watt incandescent lamp. It is not appropriate. After the actual measurement, the center of the light source is 400mm from the reading and writing table height, the illumination of the 25-watt incandescent lamp is only 220Lx, and the illumination of the 40-watt incandescent lamp is only 350Lx; even when the height is reduced to 300mm, the illumination of the 25-watt incandescent lamp is only 330Lx. The 40-watt incandescent lamp is 550Lx, which does not meet the minimum standard of 750 Lx for the best visual light environment.
7. The desk lamp should have a certain height. At this time, the illumination surface is large and the illumination is uniform. The illumination of 40 cm from the desktop should not be lower than 750 Lx. The lamp holder must also have a certain length to facilitate stretching and shrinkage. Operation, drawing calligraphy, and learning to play piano for multi-purpose use.
The truth is that it is a bit difficult to find LED desk lamps that meet all of the above requirements in the market. Therefore, many customers can only spend more than a day on the electricity bill, choose the high-definition halogen professional reading lamp from 3200-3400K to meet the optical parameters and eye hygiene requirements.
The visual lighting environment for home reading and writing is very important. The most important thing when reading and writing at home is to learn the visual lighting environment, specifically the quality of the desk lamp. There are many kinds of desk lamps in the market, such as eye-protection lamps, energy-saving lamps, incandescent lamps and LED lamps. Discriminating the quality of the learning table lamp, if the light color is white and glare, or the light color is dim, the illumination is not standardized, it is not suitable as a home learning light source, because the development of vision will have a bad influence.
Looking forward to more high color rendering, warm white tone, high light efficiency, moderate price of professional LED reading table lamp to the market, to provide you with clear and environmentally friendly learning visual lighting environment, reduce eye fatigue, reduce ciliary tendon, help protect Everyone's vision develops healthily.
Lewang Lighting is willing to continue to contribute to the platform of professional services for the health lighting industry!
Editor: Li Jie
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