Taking care of your eyes starts with a good lamp, and this is the right choice for a desk lamp
Time:2024-07-04
Views:71
(1)、 Type of desk lamp light source
1. Thermoluminescent category: incandescent lamps, halogen lamps
Advantages: The spectrum is relatively continuous and closest to natural light, making it an excellent light source.
Disadvantages: Multiple infrared spectra, high heat generation, and easy occurrence of dry eyes and bloating in the mind; In addition, the color temperature is not high, making it relatively yellow and easy to make people drowsy.
2. Fluorescent tube type: energy-saving lamp type, fluorescent tube type
Advantages: low flicker, high brightness, power-saving, and longer service life than incandescent lamps.
Disadvantages: Energy saving lamps have unstable light sources and high color temperatures, which can easily irritate the eyes when used as close range lighting.
3. LED lights
Advantages: LED lights have the advantages of small size, long lifespan, low energy consumption, green environmental protection, and no flicker or radiation.
Disadvantage: The price is relatively high, making it easy to buy counterfeit goods.
(2)、 Optical performance conditions
To determine whether a desk lamp is qualified, the first step is to meet three optical performance requirements when the desk lamp is in its normal working position.
1. Light blocking: When a person is in a normal sitting position and their eyes are looking horizontally, they should not be able to see the inner wall of the lampshade or the light source
2. Desktop illumination requirements: The working area illuminated by the desk lamp should be 250lx-500lx, and the minimum illumination should be ≥ 120lx.
3. Uniformity of illumination requirements: It should be ensured that the illumination in the working area illuminated by the desk lamp is relatively uniform and cannot produce particularly bright or dark light spots
Only by ensuring that the above three basic optical performance requirements are met can eye fatigue be alleviated.
(3)、 Tips for purchasing desk lamps
1. Color temperature value
The color temperature value of the light emitted by the lamp determines the softness of the light, and neither too high nor too low is good. 4000K to 5200K is more suitable; Among them, eye protection lamps ranging from 4000K to 4500K have slightly reddish and softer lighting, making them suitable for primary school students to use; The color temperature range of 4500K to 5200K is suitable for customers of middle school students and above.
2. Illumination height
The illumination height refers to the distance between the specific desktop of the lamp tube, which is required by the country to be greater than 40 centimeters; The eye protection lamp is below 40 centimeters, and the height of the human eye is above the lamp. The eye sees a bright and dark area, and this alternating lighting environment has a significant impact on vision.
3. Lampshade material
According to national regulations, the lampshade for eye protection lamps is made of semi transparent material. The semi transparent material will introduce some light into the dark area above the lamp tube, so that the entire lighting environment will not have too strong light and dark zones, thus achieving the purpose of eye protection. At present, many eye protection lamps still use opaque materials or recycled material spray paint as lampshades. Over time, toxins can decompose into the air, posing a threat to human health.
Power and luminous flux
The power of the desk lamp is low, and the light shining on the book is dim, making it difficult for the human eye to see the handwriting clearly, which can easily cause eye fatigue and myopia. Generally, the power should be chosen above 16 watts, but the light bulb degree should not be too high. Excessive light will be reflected into the eye through the white paper surface, producing glare, causing the pupil to continuously shrink, and then causing eye pain and headache. The brightness of a 25-45 watt incandescent lamp is most suitable; In terms of luminous flux, it should be greater than 1200lm. Some counterfeit products have high power, but the luminous flux is unqualified.
4. Glare
Glare is easy to distinguish, and any lamp tube that is directly exposed or only has a layer of transparent board added can cause glare. Sitting in front of a desk looking straight or slightly looking up can easily cause eye irritation from the light.
Finally, it is important to avoid using colored light bulbs as much as possible. Scientific research has shown that the eyes have the best vision in white light environments. Therefore, when choosing, it is best to choose incandescent, frosted, or LED lights that can emit soft and uniform white light, rather than colored light sources.
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