Which light source is good for eye protection table lamp Which light source is good for eye protecti

Study lighting pay attention to the local lighting effect of the light, with the writing desk lamp as the main lamp, under the premise of considering its brightness, but also pay attention to its appearance, its shape, color to be elegant and beautiful, suitable for the study of calm and elegant learning environment. Studies have shown that when the illumination of the surface of the object is 1000 lux, the human eye sees things most clearly and comfortably.

1.Incandescent lamps are the most used light source for eye protection.

The advantages of incandescent lamps are: no flicker, and their color rendering is also high. But it also has relative drawbacks:

It is the high heat generation of this type of light. Because the table lamp is a close-up lighting fixture, it will be relatively close to the head, and if it is used continuously for a long time. When using incandescent lamps as a light source, the more intuitive reaction is that the eyes are dry and the mind is swollen due to its excessive heat generation.

2.Fluorescent light sources are common for eye protection lamps.

Advantages: It is more power-saving and has a longer life than incandescent lamps. Cons:

The light source is unstable, the color temperature is high, and it is easy to dazzle as a close-range lighting (although some businesses claim that their table lamps are tri-color table lamps, but in essence, they use phosphors as a luminous medium, and the tri-color is just a gimmick for business publicity, and the light is much worse than ordinary monochrome fluorescent lamps due to the mixed colors of phosphors used, so it is not recommended to use).

The lamp is a real source of light for eye protection.

LED lamps have been vigorously promoted by various countries because of their long life, green environmental protection, and similar light and sunlight, and some European and American countries have been fully popularized. The qualified LED light line is pure, the color rendering index is high, the life is long, and because of the nature of its light-emitting diode, it must be powered by direct current to work, which essentially determines its no radiation, no flicker, is the real sense of the light protection source.

1. Incandescent light source: its spectrum is continuous, close to the spectral characteristics of natural light, the incandescent eye protection table lamp often has two gears, first open the low-grade heating filament, and then open the high-grade, normal use, with two gears to heat the filament first, can effectively extend the service life. Although ordinary incandescent lamps have good spectral characteristics, they have been listed as obsolete commodities by the state due to their low energy efficiency.

2. Fluorescent light source: The alternating current of China's power grid is 50Hz, that is, it changes 50 times per second. Therefore, the fluorescent lamp (fluorescent lamp) that directly uses alternating current flashes brightly, and the flickering frequency is 100 seconds, which is twice the frequency of the power grid.

The main changes that can be perceived by the human eye are within 30Hz, and the flickering of fluorescent lights has an effect on the human eye. If the light is bright, the pupil in the eye will shrink; When the light is dark, the pupils dilate. Therefore, Boxiang directly uses the fluorescent lamp of alternating current to harm the eyes.

3. Energy-saving lighting source: The electronic inverter is used in the energy-saving lamp to turn the 50Hz alternating current into high-frequency alternating current, and then use high-frequency alternating current to light the lamp. The light changes tens of thousands of times per second, and because the human eye does not have time to change with it, it cannot feel the change, so it is "unchanged" to achieve the purpose of eye protection.

The driving circuit of the high-frequency lamp will have an electromagnetic signal of 30-50kHz, which some people claim is harmful to the human body, but there is no specific report or data to prove it, and it needs to be further studied and verified.

4. LED light source: using a power adapter, it is not suitable for high-use eye environments, because the blue light is strong and the eyes are easily damaged. Small lamp beads are easy to wear, there is a problem of attenuation rate, it is easy to cause the entire table lamp to be scrapped, the general light area is small, the color spectrum is relatively narrow, it is a monochromatic light source, which will have a certain impact on the optic nerve, and it is relatively dazzling.

Ranking of eye-friendly table lamps.

1. Philips 30074 eye protection table lamp. Lighting power: 12W, power supply voltage: 220V, Adaptation bulb: LED light source, appearance color: silver, **: 279 yuan;

2. Satellite TV MTW-Y11A eye protection desk lamp. Lighting power: 11w, power supply voltage:

AC 220V 50Hz, Adaptation Bulb: Three-color DC fluorescent tube, Appearance color: yellow, gray, grass green, sky blue, dark blue, insulation grade:

National electrical insulation grade, **: 428 yuan;

3. Bright MT-306 eye protection table lamp. Lighting power: 10W, power supply voltage:

Wide circuit: 110-240V, output voltage: DC12V, appearance color:

Gold, blue, silver, function description: bi-color light source: with warm white light, positive white light two light colors, can be fused and adjusted, adjust the color temperature at will, more eye protection, **:

98 yuan; 4. Lianchuang Harmony Table Lamp DF-LP0801L Eye Protection Table Lamp. Lighting power: 2W, power supply voltage: 5V, rechargeable battery: nickel-metal hydride, polysilicon solar panel: **: 119 yuan.

At present, the eye protection table light source on the market is mainly divided into four types: incandescent lamp, energy-saving lamp, fluorescent lamp and LED lamp. Let's take a look at the details below.

Which light source is better to choose for eye protection table lamp

At present, the eye protection table light sources sold on the market are mainly divided into four types: incandescent lamps, energy-saving lamps, fluorescent lamps and LED lamps. In addition, with the development of the times, DC eye protection table lamps have appeared on the market, but because of its difficult process and high cost, only a few companies have applied for invention patents.

One of the light sources of the eye protection table: incandescent lamp.

The incandescent lamp and halogen lamp that appeared earlier can actually be identified as an eye-protecting lamp. Its biggest advantage is that the spectrum is relatively continuous and closest to natural light, so for the human eye, incandescent lamps and halogen lamps can be said to be excellent light sources. However, incandescent lamps generate a large amount of heat, and it is easy to have dry eyes and swollen heads after being used for a long time.

The second light source of the eye protection table: energy-saving lamp.

As the name suggests, energy-saving lamps are more energy-efficient and have a much longer lifespan than incandescent lamps, but the biggest disadvantage of energy-saving lamps is that the light source is not simple and stable enough, and the color temperature is high, which is easy to dazzle when used as close-range lighting.

The third light source of the eye protection table: fluorescent lamp.

Many businesses claim that their eye-protecting table lamps are three-color table lamps in the publicity process, but their essence is mostly to use phosphors as a luminous medium, and the three primary colors will be affected by the color of phosphors, and the light is much worse than the ordinary monochrome fluorescent line, so try not to choose fluorescent lamps when purchasing.

The fourth light source of the eye protection table: LED light.

LED lights, also known as light-emitting diodes, convert electricity directly into light. LED lights are popular because of their small size, long life, low energy consumption, and environmental protection. In addition, due to the nature of the light-emitting diode, it must be powered by DC to work, so it is determined that it has the characteristics of no flicker and no radiation, and has become a real source of light protection.

It is worth reminding that parents must carefully check their certificates when choosing LED lights, otherwise it is easy to buy fake products.

The latest eye-protecting table lamp**