Cold thinking under the hot sale of LED diffuser

[Reporter Zhou Jianhua] With the increasing requirements for LED finished lamps, compared with traditional tempered frosted glass, LED light guide plates and diffusers have become hot because of high light transmittance and fresh market selling points, but the market is also hot. Some low-cost inferior competition has come, and new entrants are at a loss.

Gradually hot

“This year we operate a new brand, which mainly uses light guide plates and diffuser panels for home panel lights and spotlights.” Zhang Yong, general manager of Hongjia Lighting, said that the original home lamp distribution field or tempered frosted glass spotlights Due to fierce competition, the gross profit every year is falling at a rate of 5% to 10%.

“In fact, the conversion to diffusion plate is due to the fact that the light efficiency is 20% higher than the traditional tempered frosted glass. On the other hand, there are new selling points and profit points.” Zhang Yong added.

According to the reporter's visit to LED finished products companies and Guzhen Ruifeng and other LED professional accessories stores, the proportion of finished product purchases using diffusion boards has increased from less than 35% to about 85%.

"Our traditional spotlights are also made of glass. The LED project is all using diffuser. The main requirement is that the customer's requirements and light transmittance can reach more than 85%." Director of the lighting channel, Chang Xue and introduced.

At present, the mainstream diffuser plates on the market are made of PMMA, PC, PET, etc., but this is only one of the criteria for determining the effectiveness of the diffuser. The different types of LED light sources, the distance between the light source and the diffuser are the basis of choice. If you subdivide according to this, plus the material and thickness, the diffusion plate can be matched with dozens of solutions, especially in Zhongshan. In a complex market, the various metrics are more difficult to unify.

The accessories market in Zhongshan Guzhen is very flexible in trading of parts and accessories. It needs to face individual operators and factory enterprises of various scales. Therefore, the sales pricing method is diversified. Generally speaking, it is based on weight purchase and then sold by size. It is the diffusion plate and the light guide plate together, or the whole set of lamps sold.

The high light efficiency of the flat lamp and the spotlight and the fresh spot in the market have spawned the fiery heat of the diffuser

Mixed dragon

However, with the increase in the number of application purchasers, the diffusion board market has gradually become a mixed bag. At present, relatively high-quality materials in China mainly rely on imports. PC materials such as Bayer (BAYER) and General Motors (GE) are imported from Germany, but they are almost impossible to find in the Zhongshan accessories market, mainly for high-end customized products. Zhongshan's PC materials are mainly domestically produced low-end, unnamed brand mixed materials (PC+PS). PMMA material manufacturers are more likely to accept products imported from Japan and South Korea, such as South Korea's LG, Japan's Mitsubishi, and Taiwan's Chi Mei.

“The diffuser formulation and surface texture of the market light guide plate are different, and the comparability of the concentration is not strong. For example, the texture treatment has smooth surface, matte, orange peel, etc.” Henghui Lighting is in charge of the senior engineer. Said.

It is understood that the light transmittance of high-grade imported materials is more than 94% used by first-line brand enterprises. The transmittance of mid-range imported and first-hand recycled materials is more than 80%, which is favored by general-purpose manufacturers, while the low-end products are positioned at 60%. Most of the left and right are set for the imitation of the shape of the company.

“No matter whether it is the production strength of the diffusion board manufacturer or the material of the diffusion board such as PMMA, PC, PET, etc., it is not the determination ruler that determines the effect of the diffusion board.” According to Li Wei, Purchasing Manager of Zhongshan Wode Import & Export Trading Co., Ltd. Chi introduced, because of the diversity of the demand for diffuser plates in LED lamps, it is inappropriate to arbitrarily sort the brands of the diffuser manufacturers in the market. The combination of different types of LED light sources, the different distances between the light source and the diffuser plate, the perfect interpretation of the application characteristics of various types of lamps and other multi-faceted requirements, to improve the professionalism of the lamps and more perfect to create a light environment is the basic principle of choice.

"custom" way out

If it is analyzed from a technical point of view, the light diffusing plate is a diffusing layer of light passing through a plastic substrate, and when it encounters a medium (diffusion particle) having a refractive index different from it, multi-angle, multi-directional refraction, reflection and scattering occur. Phenomenon, so that the point source achieves the light diffusion effect, providing a more uniform and more comfortable light-emitting effect for the lighting fixture.

“When the new LED point light source is widely used in the lighting industry, in order to reduce the visual discomfort of the single point light intensity of the LED light source, the lighting industry has seen a large number of applications of diffusing plates in lighting products.” Tao, "Customization and professionalism are the focus of R&D and supporting." The V.MAX brand's ultra-thin flat panel lamps for office lighting use the Japanese Mitsubishi's light guide plate and diffuser for matching, while the home improvement category is small. The panel light is selected from Taiwan's Chi Mei's light guide plate and diffuser. LED downlights and spotlight types are selected for high-transparency diffusion PC material molding. ”

Li Ruichi also stressed that although the use of diffuser will make the effect of illuminating uniform, but because the diffuse reflection and scattering diffusion characteristics will greatly change the original light distribution effect and lumen maintenance rate of the luminaire, it is recommended that enterprises When choosing, consider the rationality and professionalism of the actual application of the finished lighting products, and reduce the loss of the amount of light flux while maintaining the appearance, and truly make high-quality LED lighting products with professional products, energy saving and environmental protection.

Chart: List of diffusion boards of Zhongshan Industrial Base

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