How to check the quality of LED lights in the end

In people's daily life, lamps have almost become the most indispensable necessities for people except for glutinous rice vinegar and vinegar tea. The poor quality LED lamps not only have low service life, but also have long-term use. influences.

5 times the price difference consumer dizziness "This 3-watt 8 yuan to buy many things can give you cheaper. You can rest assured, my bulbs can live. Others dare not, but I dare to protect you for one year, take it with me and give me a new one." Yesterday, in a shopping mall near Freedom Road, a merchant saw customers asking for the price of their own LED bulbs, very warm to say hello . However, the public Mr. Xu is confused.

Mr. Xu told reporters that he has gone through more than a dozen stores and found that the LED bulbs currently on the market are not only branded but also have a wide price gap. â€œAn ordinary 3 watt LED bulb, I have found more than a dozen brands after I walked around. Although each merchant said that it is a branded goods, some brands sell for as much as 35 yuan/only, but relatively unknown. Some, just $7 or $8 can start."

In the face of this five-fold price difference, Mr. Xu made a difficult decision. Which one is better to buy?

Businesses pay real Dier wattage they do not know enough visit, the reporter noted that although most businesses sold LED bulbs are from different brands, but almost all of origin In the south, it is mostly in Zhongshan City.

Why is the price difference of a small LED bulb so great? One merchant has said the mystery: the price difference between lighting products has been very large, a well-known brand of light bulbs, merchants will provide "the quality problems can be replaced at any time within a year" service, but some ordinary brands are mostly not This service. He picked up the 3 watt LED bulbs of two different brands in his store and said, "Look at these two, one I sell 25, one for 7, this cheap, I can't guarantee you a one-year replacement." At the same time, he admits that not all LED bulbs clearly indicate the wattage, but there are still insufficient wattages. "Some bulbs are not brighter than other wattages, which is why wattage is not enough. This kind of light bulb can't be used. And the wattage of the light bulb that I bought home is not enough, let alone the consumer, that is, we don't know."

Sample testing problem exists mainly in five areas exactly how the market in the sale of LED product quality?

A few days ago, the Jilin Provincial Administration for Industry and Commerce entrusted the Jilin City Administration of Industry and Commerce to conduct spot checks on LED lamps produced and sold by 28 companies in Zhongshan, Foshan and Shenzhen. The quality inspection of the product detected indicators such as signs, lamp power, initial light efficiency, power factor, color characteristics, insulation resistance, and dielectric strength. Among the 59 groups of samples, 43 samples were judged to be unqualified, and the unqualified rate was 72.88% (the product quality inspection of the industrial and commercial departments has certain pertinence, and the test results do not represent the overall quality level of the products in circulation).

For the LED lighting products that are not qualified for the sampling inspection results, the industrial and commercial departments have ordered the relevant operators to go to the cabinets and investigate and deal with them in accordance with relevant laws and regulations.

Question 1: The mark is unqualified. The reporter learned from the Jilin Provincial Administration for Industry and Commerce that the biggest problem in the LED lamps tested this time was that the signs (marks, marks) were unqualified. Among them, 63.3% of the samples contained an "identification" failure. According to the relevant person in charge of the Jilin Provincial Administration for Industry and Commerce, the LED lamp does not indicate the rated current of the product. The rated current of electrical equipment refers to the allowable current during the long-term continuous operation of electrical equipment under the rated environmental conditions (ambient temperature, sunshine, altitude, installation conditions, etc.). The current should not exceed its rated current when working with electrical appliances, otherwise it is possible There are dangerous situations such as fever and burning. The LED module has no source mark and no manufacturer type symbol.

Question 2: The lamp power is unqualified. According to reports, the lamp power refers to the effective power consumed during normal operation, reflecting the energy consumption index of the product. Some enterprises increase the power of the low-power lamp identification in order to increase the selling price, which is quite different from the actual rated power.

Question 3: The color characteristics are unqualified. The color feature is an important indicator of the response to energy-saving lighting parameters. Among them, 34.7% of the products contained one that failed in color characteristics. The reason for the failure is the use of inferior phosphors in the production process, resulting in a significant lack of function of the lamp, which is not conducive to the protection of vision.

Question 4: The dielectric strength is unqualified. Some products have flashover (flashing) or breakdown in the dielectric strength test. It may use poor quality insulating materials or insufficient clearance and creepage distance to cause breakdown, which will cause damage to the user's life and property. Security threats.

Question 5: The electrical strength is unqualified. From the classification of electrical, LED fluorescent lamps belong to the type ii anti-shock type, which requires the input of the LED fluorescent lamp between the accessible parts and the insulation resistance and electrical strength requirements of the reinforced insulation level to be input between the mounting surfaces. At present, many LED fluorescent lamps can pass through the insulation resistance test, but the electric strength test is not passed, mainly due to the selection of the transformer of the built-in power supply and the mounting position of the aluminum substrate of the LED module. Many enterprises choose to use non-isolated transformers for the purpose of cost saving or high power efficiency. This will result in the insufficiency of the insulation level of the insulation level between the input and output terminals of the built-in power supply. At the same time, since the aluminum substrate of the LED module is in direct contact with the metal casing during installation, the insulation level between the input end and the accessible member cannot meet the electrical strength requirement of the reinforced insulation grade.

Buy LED lights need to pay attention So, when buying LED lamps, we should pay attention to what it?

An industry insider said that the huge price difference of LED lighting products is largely affected by brightness, anti-static ability and chip quality. "For example, LEDs with strong antistatic ability have long life and high price. LEDs with an antistatic greater than 700v are usually used for LED lights."

He suggested that the easiest and most intuitive way for consumers to buy LED lamps is to look at the packaging and trademarks of the products. "The packaging of genuine LED lamps should be marked with the rated voltage, voltage range, rated power, etc., as well as the brand. Trademarks and related certification marks. And the quality of the trademark printed on the LED light package is good, the font is clear, it is not easy to fall off, that is, it is wiped with a soft damp cloth, and the trademark is still clearly identifiable. However, there are even no trademarks on the outer packaging of some inferior goods. And related certification marks."

At the same time, consumers can observe whether there are cracks and loose signs on the appearance of the LED lamps they have purchased, and whether there are traces of smashing at the interface. If so, the quality of the products is not enough.
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