At the just-concluded 2016 Frankfurt Lighting Fair, the LED filament lamp once again successfully refreshed its presence. Not only did the major brands have sales, it was very eye-catching. For example, Fuxing exhibited the Venus head LED filament lamp and The core bubble can be changed, and Liquileds LighTIng from Taiwan displays flexible filament lamps. And in several pavilions of decorative lamps, it can be found that the application of LED filament lamps has been extensive, reflecting the good prospects of filament lamps. In terms of price, the price is also lower, and the current price is basically in the range of 7-10 euros.
Foreign demand for LED filament lamps is growing, and the level of attention is spreading from Europe to Europe. According to industry insiders, “different quality and performance requirements, price and application place are different. In some places, LED bulbs can not meet the application needs. This is the charm and bright future of LED filament lamps.â€
The advantages of LED filament lamp are very obvious: 1. Since the packaged device is a full-circumferential illumination type, the optical loss of one LED is small, so the luminous efficacy of the LED filament lamp is high; 2. The filament of the LED filament lamp itself is full-circumferential illumination, The cost of sub-optical light distribution is reduced; 3, LED filament lamp relies on gas heat dissipation, so the metal plastic structure is changed to glass; 4, LED filament lamp can use HV line structure to realize simple dimming function. In addition to the large-angle illuminating form of the traditional incandescent lamp, which is popular and well-known and excellent, the shape of the LED filament lamp is also popular for the application group with the "retro style" complex, plus the reasonable price of the chip, the bulb assembly The process is stable, and the relevant life regulations of the “Energy Star†and “EU Energy Efficiency†labels have been fully realized, which makes the LED filament lamp that looks like incandescent lamps find the “depression†of its application.
Mulinsen is a domestic company that is optimistic about this market. They said that the newly developed LED filament bulbs are more cost-competitive, and after saving parts and supplies, LED filaments account for 50% of the cost of bulbs. The cost of 15% has increased significantly, making LED light source technology once again dominate the cost of light bulbs.
LED filament lights may look retro, but actually contain some advanced technology. Such as LED filament design and manufacturing technology, filament lamp glass bubble sealing technology, no stroboscopic constant current driving power technology. At present, the design pattern of the LED filament lamp is to use a plurality of LED filaments to achieve a full-circumference effect through different arrangement. At the same time, various gases are also poured into the glass bulb to increase the heat conduction effect, prolong the life of the filament lamp, and quickly bring the heat of the LED to the glass lamp housing to dissipate. The filament is generally produced by using LED chips on various substrates, including sapphire substrates, glass substrates, ceramic substrates, or LED wafers on soft transparent substrates, such as Liquileds LighTIng from Taiwan. A flexible filament lamp, the main Curve is better, and the soft filament can be flexed into various shapes. The use of the substrate is also considered in terms of the ability to emit light on both sides and have heat conduction.
Of course, some people in the industry also said that LED filament lamps currently have several technical indicators that are far-fetched, such as heat dissipation and light decay, which is based on the limitation of the area of ​​the LED filament lamp substrate. In order to have a long-term development of filament lamps, it is important to break through the inherent ideas of LED lighting.
The industry believes that to improve the filament structure of LED filament lamps, the current LED filament lamps use the filling of inert gas to achieve the purpose of radiation heat dissipation, and there is a big gap between the actual application and the design effect. Also, since the LED filament is a chip in the form of a COB package, the use of some effective technical means to reduce heat generation or rapid thermal conduction is a guarantee of low light decay and long life of the LED filament lamp, such as optimization of the substrate shape and substrate material. Selection, thermoelectric shunt mode, etc.
Regarding the problem of no stroboscopic flashing of LED filament lamps, some people think that LED filament lamps are small in size and small in installation space. The limited installation space has very strict requirements on the volume of components, so it can cooperate with low power and small installation space. Drive power products only have high voltage linearity to meet this requirement. Due to the "hole" effect caused by high-voltage linearity in the rapid passage of current, it is very difficult to achieve stroboscopic flash in large-scale production capacity under the premise that the compensation technology lacks fine technical means. There is absolutely no stroboscopic and there is no absolute solution. Only the technical means can be used to reduce the "hole" effect and control the stroboscopic to a certain extent.
After the light source structure is simplified, the LED filament lamp is also faced with a certain high cost and automation scale production problem. However, with the continuous innovation of LED lighting technology, the technology of LED filament lamp has also developed rapidly, and the production capacity has been greatly improved. And then, the price will also drop correspondingly, and the increase in consumer acceptance will further promote the product innovation of LED filament lamps.
It is worth noting that after the popularity of filament lamps, the extended patent mines also need to be careful. Some people with lofty ideals have begun to pay attention to the patent protection of filament lamps, and create a healthy market environment through patent authorization between enterprises. Patent and certification become the promotion filament of enterprises. Lights are required. For example, Jingyuan Optoelectronics' patent claim for filament lamps is currently only authorized by COSMOSLED, LEEDARSON, and FSL (Foshan Lighting).
According to statistics, the total demand for LED filament lamps in the world exceeds 100 million in 2015, and will increase rapidly by more than 35% per year. Since the beginning of this year, in addition to Philips, Osram, GE and other international manufacturers, domestic Foshan Lighting, Shanghai Yaming, Yapuer, Hongli Optoelectronics, Hangke Optoelectronics, Mulinsen, Baishi, Hengxing Gaohong, Yuanlei Technology and other LED lighting plants Or packaging companies have also entered the field of LED filament lamps and added mass production. According to relevant media reports, there are nearly 800 related companies producing LED filament lamps in China. However, although the entry threshold is not high, it is not easy to do a good job or to do fine work. It is necessary to work hard to make products and create brands. In short, the development of LED filament lamps is worth looking forward to.
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