LED lens product diversification market lacks standards

In the application of LED, the main function of lens is also to carry out secondary optical design on the light intensity distribution of LED light source. After the lens factory gets the light source, it analyzes its luminous form and makes it according to the customer's light intensity distribution requirements. The key parameter is the luminous angle. Obviously, for spotlights, small angles are generally selected, however, the projection lamp and the light box must choose a large angle. In addition to the luminous angle, the design also needs to consider parameters such as brightness, light spot illuminance, uniformity, etc. In addition, there are certain requirements for material yellowing and temperature resistance. The diversification of lighting factory plans leads to the diversification of lens products, so it is naturally difficult for lens manufacturers to reduce the cost of lenses that are not produced on a large scale. The deeper reason also lies in the disorderly competition caused by the lack of standards in the entire LED industry in China. It is undeniable that some products have a standardized trend, such as lamps, generally according to the length of 0. 6 m, 0. 9 m, 1. , MR16, PAR30 and PAR38 also have standards, but they are only appearance requirements. Specific requirements such as light efficiency and color temperature still have their own standards, the lens factory only tailor-made lenses for various light sources and customer requirements. At present, there are street lamps made of 100lm light source, and there are also street lamps made of 140lm light source. Obviously, the lenses are also different. Hu Lihua stressed. Indeed, judging from the current lamp prices, the cheap ones can reach 1 yuan/W, and the expensive ones can even reach 7 US dollars/W. Naturally, the demand for lenses for lamps of various grades is also different. Many enterprises are sensitive to prices. Although our quotation is not very high, some customers are willing to buy cheap lenses made of nozzle materials. Xue Teng said that it seems a bit helpless. Indeed, now Zhongshan has a lens offer of 7 points/piece, and the general lens offer is a few corners/piece. The reporter noticed that these cheap lenses are prone to yellowing in less than half a year, and even the bottom melts, which seriously affects the quality of the lamps. Most of the cheap lens manufacturers do not have their own optical research and development team, and lens development relies on plagiarism. No IQC, no QC, even no quality inspection. They don't have a dust-free workshop, they often finish it in an empty large iron shed, let alone the anti-static and anti-dust treatment in the production process. The finger cuff is not replaced once every hour to prevent the lens from entering impurities and the black spot problem affects the appearance. At the same time, cheap lenses and lens materials produced by regular manufacturers are also very different. Good lenses are generally made of imported materials. The light transmittance of imported materials will be better. For example, the light transmittance of Japanese Mitsubishi, a good material, can reach more than 90, but the light transmittance of domestic materials is only 80. Liang Wenyu, director of Hesheng hardware lighting accessories factory, said. Reporters can see from the market research that the thicker the lens, the lower the light transmittance requirement. Generally, the light transmittance requirement of 2mm acrylic is 93, PC89-90. In addition to light transmittance, some customers have special requirements, such as the use of diffuse materials or materials with certain fire rating requirements. Imported materials perform better in vulcanization and yellowing, which can ensure heat resistance, and there is less dust in the production process, which is not easy to form black spots. Hu Lihua said that based on the internal stress treatment in the production process, the treatment method is acrylic at 90-95 incubator baking, PC in 120- 150 thermostat is baked to release internal stress, so their products have the confidence to provide 3-5-year warranty. Indeed, injection time is also a key point to ensure the quality of the lens, because the internal stress of the lens with short injection time is not easy to release and easily deform. According to the reporter's understanding, generally, lens manufacturers with quality assurance can only produce 8000- There are 9000 lenses, but some manufacturers in Zhongshan, regardless of quality, can produce tens of thousands of injection molding machines on average every day. The trouble is the problem of internal stress, which cannot be seen when the lens is just used, but a series of problems such as deformation and yellowing usually follow after half a year. As the saying goes, every penny counts. For low-end lighting factories, as long as the price is low, a series of problems such as black spots, deformation, yellowing and even light distribution deviation that will occur after half a year are not problems. In addition to the above, the lens factory also has high requirements for hardware capabilities. Generally, large factories use imported injection molding machines. The good ones are Japanese and German equipment, and Taiwan equipment again. Generally, domestic equipment is not considered. Moreover, optical injection molding machines must be used, but the general specifications of this kind of injection molding machines are relatively small, and the production capacity will be much lower for ordinary injection molding machines used for mobile phone shell production.