To judge whether it meets the safety standards, we only need one step, and that is to look at 3C certification, the compulsory product certification in China. It should be noted that the 3C mark is not a quality mark, it is the most basic safety certification, and safety cannot be directly equated with good quality.

This certification can generally be found on the details page, and you can also find the "CCC" logo in the details of lamps.

Step 2 look at the experience

Experience is the most intuitive way for users to judge the quality of lamps. What kind of lamps can be called "good things"?

Look at six indicators: excellent illumination, anti-glare, high color rendering index, no strobe hazard, moderate color temperature and no blue light hazard.

These six indicators are not only comfortable to use, but also directly related to vision health.

2. 1 lighting

Illuminance is the intensity of light in lux, which refers to the luminous flux of visible light received per unit area. In other words, this illuminance is used to answer the question of the brightness of light, that is, whether the lamp is bright enough. National regulations also correspond to a series of illuminance standard values of residential buildings:

The lighting standard values of residential buildings are as follows: living room: general area 100lx, reading and writing area 300lx, bedroom: general area 75x, reading and writing area 150lx, kitchen: general area 100x, operation desk 150lx, and dining room:/kloc-.

2.2 Anti-glare

When we look at the sun carelessly, we will feel very dazzling, that is glare. Glare that can cause certain harm to eyes, mainly inappropriate glare and disability glare.

Not adapted to glare-due to improper brightness distribution, there are bright light sources in the line of sight, causing visual discomfort. Avoid not looking directly, but if you are in an environment that is not suitable for strong light for a long time, it will cause problems such as visual fatigue, soreness and tears, and decreased vision. Disability glare-visual function decline or temporary blindness caused by glare light source.

Different environments have different building daylighting standard, so glare value URG≤ 19 is generally selected for daily use.

The downlights and spotlights favored by home improvement design need additional anti-glare treatment in addition to the anti-glare index.

This involves the shading angle. Lamps with shading angle less than 30 will produce dazzling glare to human eyes, and the shading angle of lamps should be about 45, and lamps designed with anti-glare net can also be selected.

At present, the downlights and spotlights with deep anti-glare effect on the market can't see the light when they see the light, and the shading angle is about 60.

2.3 High color rendering index

Color rendering index is a measure of the ability to restore the original color of an object. The color rendering index of sunlight is 100. Theoretically, the closer the light value of the lamp is to 100, the better the color rendering performance, the less the color distortion, and the higher the color discrimination accuracy.

The general color rendering index roughly divides the color rendering of light sources into four categories:

Poor: below 50;

Generally: 50 ~ 70;

Good: 70 ~ 80;

Excellent: above 80.

According to the above standards, the requirements for color rendering index in applications can be roughly divided into:

Generally, the lighting area should be above 80Ra, and the area with high eye consumption should be above 90Ra, which is not easy to cause visual fatigue.

2.4 No stroboscopic danger

Strobe is produced by the transition of light source's light-dark dividing line, which is generally divided into video flash and non-video flash. Strobe has a great influence on eye health. Strobe can lead to tears, dry eyes and fatigue, decreased vision, and may even induce migraine light.

The country has a standard for this indicator-the stroboscopic fluctuation index must be reduced by less than 8% to meet the standard. If the naked eye can see the flashing lights, it is definitely not up to standard.

Fortunately, the current LED lights, monitors and other equipment can basically achieve no video flash, but the key still depends on whether there are relevant inspection certificates.

2.5 medium color temperature

The higher the color temperature, the whiter the light, the lower the color temperature and the warmer the light. General rest area, 2700K~4000K is more suitable. Especially at night, don't use a color temperature higher than 4000 K. A slightly warmer color temperature-about 5500 K-can make people feel comfortable and happy.

Many friends prefer white light with a higher color temperature (above 6000K), thinking that this color temperature will make people concentrate, see things more clearly, and help improve the efficiency of study and work. But a high color temperature means more blue light, which is more harmful to the eyes.

But many times, a place will have multiple functions, such as a bedroom. In addition to sleeping, you can also study, read and entertain. Different functions require lamps with different color temperatures. Faced with this situation, it is suggested to buy a ceiling lamp with a three-tone lamp.

2.6 No danger of blue light

Blue light can make the eyes tense for a long time, causing visual fatigue. Long-term visual fatigue may lead to people's myopia deepening, diplopia, easy serial reading, inability to concentrate and other symptoms, affecting people's learning and work efficiency.

It will also inhibit the secretion of melatonin, which is why playing mobile phone before going to bed will cause poor sleep quality and even difficulty falling asleep.

The complete elimination of blue light will cause the light to not truly reflect the original color of the object, but will make the light unacceptable, so the lamps will be required to control the blue light within a reasonable range.

According to the hazard risk from low to high, the retinal blue light hazard groups are RG0, RG 1, RG2 and RG3. At present, the safety standard stipulates that the blue light hazard group of LED lamps should not exceed RG 1 or RG2. In order to better protect the young eyes of teenagers, GB/T 9473-20 17 stipulates that the retinal blue light hazard group of reading and writing desk lamps should not exceed RG0.

How to choose a good anti-blue light? Look for it-"Blue light danger level RG0"

3. Configure quality from the core

The competition of LED lamps in the market is fierce and the quality is uneven. The price difference of LED lamps with the same color and brightness is 2 or 3 times.

The price difference is big and the quality difference is even bigger, which is mainly reflected in the hardware configuration of LED lamps.

3. 1 lamp bead quality

The price of lamp beads is mainly determined by service life and light efficiency.

Chip: The quality of the chip determines the brightness and light attenuation of the lamp bead. The key of LED chips with different qualities is the life span, which is determined by the light attenuation. The light decay is small, the life span is long, and the price goes up. The service life of LED lamps of big brands is basically 20,000 ~ 50,000 hours or more. If you use it for 8 hours every day, the good quality can be used for more than 6 years.

Generally speaking, the chips in the United States and Japan are of good quality and more expensive, followed by Taiwan Province Province, and the LED chips in China are more economical.

Light efficiency: The higher the light efficiency, the higher the brightness of the lamp beads with the same power. The same lighting brightness, the less power consumption, the more energy saving. The better the color temperature of the lamps in the same batch, the higher the price.

On the contrary, low-priced LED lamps have smaller chip size, rough electrodes, poor materials (phosphor and glue), fast light decay and short life.

3.2 Driving power supply

The power quality of LED lamps also affects the price.

The service life of power supply affects the overall service life of lamps. The theoretical life of lamp beads is 500-65438+10,000 hours, and the theoretical life of power supply is 0.2-30,000 hours.

Excellent power supply can be used for 3~5 years in actual use, and inferior power supply may be replaced once a year. The price difference between them ranges from 20 yuan to 30 yuan.

3.3 Heat dissipation design and materials

LED lights generate heat when they work. If the heat is not output in time, the lamp will be damaged.

The applicable scope of general safety regulations is -20℃ ~ 65℃. The temperature is mainly related to the power of lamp bead, radiator and lamp bead, and it is also necessary to judge whether the heat dissipation design of lamps is reasonable. Too high temperature can easily lead to serious pearlescent failure of lamps, and even bring security risks.

Take the LED ceiling lamp as an example, its heat dissipation mainly focuses on the chassis material and heat dissipation design of its lamps. The same lamp, different chassis materials, different thermal conductivity, the final heat dissipation effect is also very different.

In terms of heat dissipation effect, aluminum and iron have priority over plastic materials, and the larger the substrate area, the better the heat dissipation effect will be. But also has good heat dissipation and long service life.

In addition to material and design, high-power lamps need to be equipped with radiators. Generally speaking, the greater the power of LED, the greater the calorific value, while the ordinary radiator has the maximum power limit, so the greater the power when buying lamps, the better.