How to judge the quality of a ceiling lamp?
First of all, we should understand that a lamp (no matter what kind of lamp) is composed of three parts: lamp body, light source and electrical appliances, of which the most important part is the light source, because it is the part that can really bring lighting effect to everyone. Lamp body is generally used for decoration and auxiliary light source, and electrical appliances are used to make the light source shine stably or give the light source instant starting voltage. Therefore, for lamps, the light source is the most important.
Step 1: detect the light source
To judge the light source, we should start with the following points:
1. luminous flux: As the name implies, it is how much light is emitted by the light source.
2. Color temperature: it is the temperature of the color of the light source, commonly known as "yellow light" and "white light". In fact, it is not called this in the industry, and it is usually expressed by a numerical value. Yellow light means "below 3300k", white light means "above 5300k", and there is an intermediate color "3300k-5300k".
3. Color rendering: the degree to which the light source reacts to the true color of the object. We think that sunlight and incandescent lamps have the best and truest response to the color of objects, so their color rendering is defined as 100. Generally, the color rendering index is above 80, which is a better light source, but the ceiling lamp is more difficult to do.
4. Average life expectancy: This is different from other things. Light sources all mean average life, which means that a number of light sources are lit at the same time. When 50% of the light sources fail, it is the average life of these light sources. Now the general ceiling lamp will be guaranteed for one year. In fact, their life span is far more than one year, and everyone can use it with confidence.
5. Light efficiency: This indicator is very important, which means that different light sources consume the same amount of electricity at the same time and how much light is emitted. In other words, the same strong light may consume different power, and the light source with high light efficiency will definitely save electricity than the light source with low light efficiency.
6. Strobe: the number of times the light source flashes per second. Why do some fluorescent lamps at home always feel that they are flashing? In fact, it is because the electrical equipment is not good and can not provide him with a stable voltage. The light source with large stroboscopic frequency is the most harmful to eyes, and the stroboscopic frequency of fluorescent light source is more serious.
? How to judge the above six indicators?
Since most ceiling lamps are white, let's take a look at the white ones. When choosing lamps, some owners will find out why some ceiling lamps look brighter, some are darker, some are white, some are purple or blue. This is because the light efficiency and color temperature of light sources are different. Some small manufacturers produce light sources with low light efficiency, but in order to make customers look brighter, they make the color temperature higher, which makes them look brighter. In fact, it is not really bright, but the illusion of the human eye, which is harmful to the eyes and easy to fatigue. In this environment for a long time, vision will get worse and worse, so why are children prone to myopia? That's because the light source is not good.
Light with high color temperature looks blue or purple. People in the industry know at a glance that the color temperature is wrong, but customers often can't tell. Here's a way to teach you, that is, you don't need other light sources, just light a lamp and read under it (if you choose a desk lamp or an energy-saving lamp, you can read at a distance of 1m from the light source). If it looks clear and bright, it means that this light source is better and has high light efficiency. If you can't see clearly, blur and don't shine, it means that the light efficiency is not really high, but the illusion of the eyes. It is easier to judge whether the color temperature of a light source is too high. Put your palm next to the light source and look at the color of your palm. If it is rose, it means that the color temperature is just right and the color rendering is good. If the palm is blue or purple, the color temperature is too high.
? Step 2: Look at the electrical appliances.
Everyone should know that all fluorescent light sources can only be lit by ballasts, which can bring instantaneous starting voltage and stable voltage when working for light sources, and fluorescent lamps without ballasts are not lit! The quality of ballast directly determines the life and light efficiency of this lamp. Usually, the more formal the manufacturer, the better the ballast quality.
? Step 3: Look at the mask.
Have seen the inside of the lamp, and then look at its front. At present, there are many manufacturers producing ceiling lamps on the market, and the mask materials used are also different. The most common ones are acrylic masks, plastic masks and glass masks. The best is the imported acrylic mask that has been stretched twice. Acrylic is a kind of plastic, which is characterized by softness, portability, good light transmittance, being difficult to be dyed and not reacting with light and heat to turn yellow. Its light transmittance is the most concerned by customers.
Generally speaking, the transmittance of plastic masks can reach up to 60%, while that of acrylic masks can reach over 90%. Moreover, the acrylic mask after secondary stretching has uniform light transmittance, and the light source can not be seen from the surface, and the glass mask is even worse. If it is not installed firmly, it will hit people if it falls. The price of acrylic is also the highest. Generally, 40w products are above 100, the retail price of good brands is around 140, and plastic products are around 60% and 70%. Generally, good brand manufacturers don't have this product. This product is made by a small manufacturer, and the cost is very low. Many of them are made of saliva, which has poor heat resistance and is easy to turn yellow. Now glass products are basically cheaper.
First, press the mask by hand to see how soft it is. Then reach out your palm and look at the color. Just be ruddy. Finally, open the lid to see if it is convenient to take it off, because it is inevitable to take it off and scrub it, and sometimes mosquitoes will go in. If it needs cleaning, it will be more troublesome to buy one that is not easy to disassemble. At present, some large factories use rotary disassembly, and it will come down with a little twist. Very convenient. Good brand products are humanized and have mosquito-proof mats, so mosquitoes will not easily enter. Open it to see if the buckles of light sources, electrical appliances and wires are firm and the wiring is neat. But if the above conditions are met, the prices are basically around 40w 140, 38w 100, 22w 70, 10w 30.
Recommended brand:
Opal Lighting: A lighting enterprise focusing on household products (ceiling lamps) is undoubtedly the first brand of ceiling lamps in the industry, and its terminal influence is also very good. However, its products also have several defects. First, the mask material is too thin to be stretched twice. Although soft and translucent, the light is uneven. You can clearly see that there is a black spot in the middle to prevent mosquitoes, and the effect is not very good. The old product has no anti-mosquito ring, the chassis is not curled enough, and it is easy to hurt your hands when installing. However, his products are still very good on the whole, with good color temperature and service life. It's a good choice if you don't mind a black spot in the middle.
NVC Lighting: A lighting enterprise mainly engaged in commercial lighting products, and now it also has ceiling lamps. Objectively speaking, the market influence of ceiling lamps is not enough, but the products are not worse than Opal, but the styles are not as much as Opal and the quality is good.
TCL Lighting: Everyone has heard of the brand, which is very influential outside the industry. But in the lighting industry, it is not a high-end brand and has no characteristics and advantages. However, after all, it is a regular manufacturer, and the quality is relatively guaranteed, so you can buy it with confidence.
Tips:
1. Buy products with the promise of "three guarantees" in big stores, and buy lamps with CCC certification mark.
2. Watch it three times when shopping. A look at whether the product logo is complete, the logo of regular products is often standardized, and it should be marked: trademark and factory name, product model and specification, rated voltage, rated frequency and rated power. Second, see if the power cord of the lamp has CCC safety certification mark, and the cross-sectional area of the outer conductor should be ≥ 0.75mm2 Third, see if the charged body of the lamp is exposed. The light source is installed behind the lamp holder. Should fingers not touch it? And a charged metal lamp holder.
3. Choose a more advanced type of protection against electric shock: According to the type of protection against electric shock, ceiling lamps can be divided into 0, I, II and III levels. Class 0 lights are not safe, so try to buy class 1, class 2 and class 3 lights.
? Class 0 lamps rely on basic insulation to prevent electric shock. If the basic insulation fails, it is easy to get an electric shock.
? The protection against electric shock of the first-class lamp not only depends on the basic insulation, but also includes additional safety measures, that is, connecting the easily accessible conductive part to the grounding protection conductor so that the easily accessible conductive part will not be charged when the basic insulation fails.
There is a grounding symbol next to the grounding terminal of a class of lamps. It should be noted that the metal shell of Class I lamp should be effectively grounded, and if the replaced lamp can touch the ballast, the ballast should also be effectively grounded.
? The protection against electric shock of Class II lamps depends not only on basic insulation, but also on additional safety measures, such as double insulation or enhanced insulation. In the case of failure of basic insulation, you can also rely on the protection of auxiliary insulation. Plastic shell lamps are generally class 0 or class II. It is best to choose class II lights, which are marked.
The protection against electric shock of the third-class lamp depends on the power supply as the safe ultra-low voltage, and the voltage in the lamp will not be higher than the safe ultra-low voltage. ?
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