What is the current market for LED filament lamps ? From the overwhelming promotion of a large number of manufacturers in Guangzhou Guangya Exhibition in June, we are not difficult to search for results from major B2B, B2C and other websites. It is found that the LED filament lamp is now described as "hot". And from the current trend of the entire market, its popularity will continue to burn.
Why is it suddenly hot? Is the light effect as claimed? Is the light distribution perfect for 360Â° full-light? How is the heat dissipation performance? Is the process structure safe enough? Why is such a hot product difficult to find on the market?
The evaluation room specially planned the evaluation of the LED filament lamp in this issue, aiming to make a more comprehensive, more realistic and more objective display of this product in the industry.
This evaluation selected representative manufacturers in the industry: Shanghai Yapuer, Foshan Lighting, Sichuan Baishi Optoelectronics, Hangzhou Hengxing Lighting (Hangzhou Lin'an Hengxing Lighting Appliance Co., Ltd.), of which Yapur and Buddha are typical traditional lighting transformation enterprises. Hangzhou Hengxing Lighting is the first batch of e-commerce test water representatives of filament lamps.
Sample and testing equipment
LED filament light detection data
This time for the three LED bulb test, according to "GB/T 24392-2009 lamp head temperature rise measurement method", the test data are in line with the "GB 24906-2010 general lighting 50V self-ballasted LED lamp safety requirements" Safety requirements regarding the temperature rise of the lamp cap. The value of the temperature rise of the lamp cap should only be used as the basis for judging whether it meets the safety requirements, and should not be used as the basis for judging the quality of the finished lamp.
Light distribution curve
A little doubt and worry about the LED filament lamp
Why did the LED filament lamp that appeared in 2008 suddenly burst into flames during the year? In my opinion, two factors played a major role. First, the packaging enterprises are increasingly competitive. The traditional light bulb factory is facing the stage of exiting the lighting history. Therefore, some packaging companies and traditional light bulb factories hit it off and become the â€œfertilizerâ€ of LED filament lamps. Second, the â€œnostalgic feelingsâ€ of a large consumer group. This nostalgic feeling for incandescent lamps is the soil that the LED filament lamp market can grow rapidly. However, this kind of thing will gradually disappear or shift over time in most people, especially in consumable electrical lighting products.
Not much to say outside the topic, the following return to the technical discussion.
For those who have been mixed in the LED industry for many years or for a considerable number of technicians who are really engaged in the LED industry, there is a lot of doubts and concerns about the current popularity of LED filament lamps.
As lighting products, especially LED lighting products, we pay attention to the issues of light efficiency, light distribution, heat dissipation and light decay, power supply and process structure reliability. The following is the author's actual contact with the test, as well as the problems encountered by peers to share.
The word light efficiency and energy saving can be equated in a certain sense. At present, LED filament lamps on the market are said to have a luminous efficacy of 110 lm/W or more. However, in January of this year, I tested a product of 3W in Shenzhen, a product with a color temperature of 3000K. The actual measurement is 2.3W. The actual light efficiency is 72.5lm/W under the condition of power-on and light test. After lighting for 10 minutes, the test is again tested, and the light efficiency drops to 62.9lm/W. It can also be seen that the luminous flux is affected by the temperature. The LED bulbs generally made with SMD LEDs as the light source are actually tested at around 80-100 LM/W. So in my opinion, there is no advantage in the current stage of LED filament light.
"Sapphire bracket, light on both sides, 360 Â° light", this is another selling point of filament lamp. Regardless of whether or not the bulb 360Â° illumination is really needed, the light emitted by the LED filament lamp itself has a light defect. For the filament itself, the sapphire bracket plus two sides of the light seems to achieve 360 â€‹â€‹Â° illumination, but after the filament is loaded into the bulb, can it reach 360 Â°?
When we installed the LED filament lamp in the same way as an ordinary incandescent lamp and lit it, we found that there is a "flower of blooming light and shadow" directly under the LED filament lamp. The shadow phenomenon is obvious and has seriously affected the human eye. Look at things. This is obviously not suitable for simply replacing incandescent lamps as the main illumination source for indoor use. Of course, if you use it as an accessory light source such as a crystal chandelier, you can ignore this problem.
Heat dissipation and light decay
At present, most technical engineers are not optimistic about the main cause of LED filament lamps or heat dissipation problems. The quality of heat dissipation directly affects the light decay of the product. Many engineers are still studying the heat dissipation technology and materials of LED lamps. In order to find a more cost-effective heat dissipation solution, the LED filament lamp was born with its "no heat sink" structure, and issued a "good heat dissipation" and "heat dissipation is not Question" this voice. This huge contrast makes engineers skeptical about this product.
LED filament lamp solves the problem of heat dissipation. Now we see the most two steps: firstly, the driving method of the filament strip is changed from the low voltage and large current to the high voltage and small current, and then the inert gas is filled in the bubble to enhance the heat dissipation. . From the most basic law of conservation of energy, if the total power of the LED filament is constant, if the luminous efficiency is constant, that is, the optical power is constant, then no matter whether it is low voltage, large current or high voltage and small current, the power wasted on the heat. The same is true, the argument that high voltage and small current can reduce fever is obviously not established. As for the inert gas to enhance heat dissipation, it is undeniable that it can play a role. According to an analysis report of the New Century LED Forum, when the 6W LED filament lamp is filled with inert gas, the junction temperature on the LED filament is 120 Â° C, and the temperature rises to 140 Â° C after the inert gas is released. Such a high junction temperature will be a rather cruel test for LED filaments - even now various technologies and materials are constantly evolving. The temperature is so high that the light decay is unavoidable.
Actual verification: 6W LED bulb with SMD LED+ die-cast aluminum radiator, the initial 1000H luminous flux is on the rise, after 1000H, the luminous flux reaches about 103% of the initial value; and the aging 100 6W LED filament lamp is uninterrupted. After lighting 100H, the light decay is about 5%. This filament bulb 100H has a light decay of 5%, indicating that the light decay has been quite powerful. At the same time, the LED filament lamp constantly appears dead light during the aging process. (Note: These products are said to be using LED filaments packaged by a well-known brand in Korea.)
Power and process and structural reliability
Power is the most important part of the product's life. When the author tested and analyzed last year, the driving method of the sample was to use the resistance to reduce the voltage. In April, one sample was changed to linear constant current. Some manufacturers in the market use non-isolated constant current solutions. It is not possible to simply judge which kind of driving method is good or bad. What is important is whether it can meet the standard requirements of the relevant stage.
Process and structure are also common issues. Due to the problem of production process to be solved, the high defect rate leads to cost increase, and the after-sales failure is often bad, which will cause the market to trust the filament bubble to decline. There is not much to say nonsense, just take a picture on the map and explain it to everyone.
The problem of fragile glass bubbles is not the focus of our discussion here.
Finally, one of the more popular sayings in the industry is that if the above problems cannot be solved, the LED filament lamp is a transitional product. Of course, even a transitional product does not prevent individual manufacturers from making profits from him in the process. After all, it is the last word that a company can live.
The above analysis, a lot of data from the research and testing at the beginning of the year, hereby explain.
to sum up
Through this test, the data of the beginning of the year given by the engineer Luo Bingwang, we can find that the filament lamp has improved in different performances such as luminous flux and light efficiency in the past half year, and the power can be made slightly higher than before.
Because of the evaluation of this new LED filament lamp for the first time, there have been many difficulties in the middle. Some enterprises did not participate because of the high power of the test samples, and the side also reflected the current problem that the power of the filament lamp could not be increased.
In addition, for the "nostalgic feelings" of the filament lamp, more for the European and American regions, the filament lamp is mainly used for export. Foshan Lighting has a relatively large promotion in domestic terminals. In several major lighting cities in Guangzhou, there are samples of Buddha photos, and other brands are rarely seen. Dealers also lack understanding of filament lamps, and most dealers do not know the new product of filament lamps.
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