The illumination of the desk lamp is suitable. Table lamp is one of the common lighting lamps now, which is usually placed in study and bedroom. Pay attention to the brightness when choosing a desk lamp. Too high brightness will irritate the eyes and cause fatigue. The illumination of the following kk desk lamps is suitable.
How much illumination is appropriate for the desk lamp? 1 The lighting frequency is high enough;
Eye protection desk lamps generally require more than 40,000 times of illumination per second to ensure that the light continues to be stable to high-frequency flash instead of no stroboscopic flash;
Lighting area: The lighting area and luminous uniformity of eye protection desk lamp are also very important. High-quality eye protection desk lamp products will have the characteristics of uniform light, large lighting area, no glare and no shadow. Only studying under such lighting conditions is the best protection for eyes;
Correct color temperature: In order to improve the illumination, many students choose a light source with higher color temperature to provide illumination. In fact, different color temperatures have different stimuli to the eyes, and too high color temperatures are more likely to make the eyes feel tired. The correct luminous color temperature of eye protection desk lamp products should be close to natural light 1am;
Safety performance: it is mainly required that the power cord and internal electronic wires have sufficient conductor cross-sectional area and insulation layer thickness. The minimum distance between the anode and cathode of the circuit board is greater than 2.5MM, and the overcurrent protection device and the lamp holder switch meet the national requirements. Poor quality eye protection desk lamp can not meet the above requirements, which may easily lead to fire and child injury accidents.
If it is an eye protection lamp, the maximum value cannot exceed 13W. Strong light is also harmful to the eyes. Don't think that the brighter the better.
It is recommended to use LED eye protection lamp.
LED eye protection lamps generally have low wattage and low power. Many big brands of LED table lamps have dimming function, so don't care too much about wattage. Wattage is not directly related to good eyes, but a matter of personal habit.
The eye protection desk lamp is made of materials without flicker, stroboscopic and eye fatigue, with all-metal texture, elegant and classic. It adopts high brightness and low light attenuation LED patch, and is driven by low voltage DC 12V switch with constant current, without stroboscopic and radiation. Unique polarizing film light guiding technology makes LED light output uniform and directional, without glare and myopia prevention.
How much illumination is appropriate for the desk lamp? 2. In what range is the brightness of desk lamp good for eyes?
The brightness of the desk lamp is better for the eyes in the range of 25-40 degrees. Incandescent lamps in this brightness range are also called eye protection desk lamps. In addition to brightness, the color temperature of the lamp is also important. The color temperature suitable for reading and learning is 4000k K K. The light at this color temperature is very soft, not easy to glare, and the color will not be too warm to cause drowsiness.
Second, how to choose a household desk lamp?
1, see the advantages and disadvantages of light source.
There are many kinds of table lamp light sources in the market, including incandescent lamp, halogen lamp, full-spectrum LED lamp, fluorescent lamp and ordinary LED lamp, and their light sources have their own advantages and disadvantages. Among them, incandescent lamps and halogen lamps are relatively good, mainly in terms of spectrum, color rendering and color temperature. They are close to natural light and will not harm eyes, and their color temperature is constant, so they belong to warm yellow light sources. However, in terms of light stability, LED lamps are the best, and there will be no problems that affect the eyes such as stroboscopic.
2. Look at the function selection
Nowadays, the functions of desk lamps are very diverse, ranging from simple to complex, from simple switch function to automatic dimming function, from fashionable design to many functions. You can choose according to your own needs and preferences.
How much illumination is appropriate for the desk lamp? What is the illumination standard of 3 LED table lamps?
1, national certification requirements: the study desk lamp must pass the national compulsory 3C certification and be within the validity period;
2. Adopt warm white light source: the color temperature is 3200-3400K, which is most suitable for people's visual physiology.
3, intuitive desk lamp: light can not be direct or refracted eyes, strictly eliminate glare. The simple test method is as follows: when the eye height is 400mm away from the reading and writing desktop and the horizontal distance is 600mm away from the center of the lamp light source, you should not see the direct light or refracted light in the lampshade;
4. Detection of desk lamp illuminance: The best visual light environment is when the illuminance is 750- 1000Lx from the center of light source to the height of reading and writing desk 400mm;
5. Simple test of clarity and color reproduction: put your palm up and put it 30 cm under the lamp. If the palm lines are clear and the palm fingers are rosy, it means that the lighting is clear and the color is good; On the contrary, if it is fuzzy, dark yellow or gray, the light of the desk lamp is poor. The clarity of a desk lamp with a color rendering index greater than 90 is much higher than that of an ordinary color rendering desk lamp with a market share greater than 95%.
6. Selection of light source power: It is claimed that the LED desk lamp is most suitable when the brightness is equivalent to an incandescent desk lamp of 25-40 watts, but it is not suitable. According to the actual measurement, when the center of the light source is 400mm away from the reading and writing table, the illumination of the 25-watt incandescent lamp is only 220Lx, and that of the 40-watt incandescent lamp is only 350Lx. Even if the height is reduced to 300mm, the illumination of 25-watt incandescent lamp is only 330Lx, and that of 40-watt incandescent lamp is 550Lx, which can't meet the requirements of the minimum standard of 750Lx for the best visual light environment.
7. The study desk lamp should have a certain height. At this time, the illumination area is large and the illumination is uniform. The illuminance at 40 cm from the desktop should not be less than 750Lx. The table lamp bracket should also have a certain length to facilitate expansion and contraction. Suitable for computer operation, painting calligraphy and learning to play the piano.