As the LED lighting market continues to increase in capacity, the LED light strip, which is the “maincomer†of decorative lighting, is widely used in home lighting, decorative lighting and advertising lighting with its strong decorative and aesthetic features, while urban night scenes, Places such as landscape lighting can be seen everywhere in the "light shadow" of LED lights.
Different classification functions
In terms of materials, LED strips are divided into LED hard strips and LED strips. LED hard light strips are assembled with PCB hard boards and assembled with patch LEDs . Some manufacturers use in-line LEDs for assembly. It is understood that there are 18, 24, 30, 36, 40 and other specifications for LED LED strips; 18, 24, 36, 48, etc. Different specifications, both positive and side. Because LED hard light strips have fast heat dissipation, long service life, easy fixing, processing and installation, they are widely used in places where high quality requirements are required.
The LED flexible strip is assembled with FPC and assembled with SMD LEDs so that the thickness of the product is only the thickness of one coin. The general specifications of LED flexible strips are 30 cm long, 18 LEDs, 24 LEDs, and 50 cm long, 15 LEDs, 24 LEDs, and 30 LEDs. Because FPC is soft, it can be bent, folded and wound freely. It is suitable for use in irregular places and small spaces. It can also be bent and wound freely. It is suitable for commercial, home improvement, outdoor, entertainment, Any combination of patterns in the ad decoration. With the maturity of technology and the decline in raw material costs, LED flexible strips are being accepted by the average consumer in the market for their low price and variability in shape.
From the application of LED strips, the product attributes of LED strips and LED strips determine the application location of the two products, and their market popularity is also different, but for the current application range, LED Soft light strips are relatively more extensive, and the price of LED flexible strips is also more acceptable to consumers.
In terms of voltage, LED strips can be divided into high-voltage LED strips and low-voltage LED strips. High-voltage LED strip, the main material is made of PCB board and transparent rubber injection molding into a belt process. There are two alloy wires on both sides of the formed strip. The light source is in the middle of the belt, and the high-quality LED lamp with good texture has a high gelatinity. The high-quality high-pressure lamp has a neat, clean, transparent and non-contaminating appearance, while the inferior quality has a grayish-yellow appearance. The main feature of the high-voltage LED lamp belt is that its length can be fully bright at 50 meters or 100 meters. The disadvantage is that the high-voltage safety performance is relatively poor. The low-voltage LED lamp has a completely different appearance than the high-voltage LED strip. It has no double-alloy wire. Due to the low voltage, its wiring is directly attached to the PCB board. The main feature of the low voltage LED light strip is safety and reliability. The biggest drawback is that the longest can only be about 10 meters.
At present, the more conventional LED strips on the market are 3528 and 5050, 2835 strips. 3528 refers to the size of the LED light source, 3.2mm long and 2.8mm wide, 5050 means that the length and width of the LED light source are 5.0mm. The difference between the two is that the size is different. On the other hand, there are 3 LED chips in the 5050 lamp bead, and there is only one LED chip in the 3528. Therefore, under the same number of beads, the brightness of the 5050 LED lamp is 3528 LED strip. 3 times, the power is also 3 times, and the price is also more expensive than the 3528 LED lamp.
The appearance is not as strong as the inner one.
Although the LED lamp has a strong decorative effect, the appearance is not as strong as the inner one. For the LED light strip, the parameters of the product are also a major factor that the merchant and the consumer consider when purchasing. In order to have a deep understanding of the product parameters of the LED strip and the current market situation, the large-scale lighting platform has conducted research on more than 20 well-known LED strip manufacturers such as Auman Lighting, Foshan Lighting, Op Lighting, Tongfang Lighting, etc. Display and contrast from materials, dimensions, power, voltage, light source, lamp bead, color temperature, light efficiency, and indexing, in order to provide some help to terminal merchants and consumers when choosing LED strips.
From the table, we can see that at present, most LED strips produced by LED strips are high-voltage strips, such as Auman, Foshan Lighting, Op, Tongfang Lighting, Zhaoxin LED, Jiasheng, etc. Only some manufacturers such as Shenzhen Di Ruixiang Optoelectronics produces low voltage lamps.
The quality of the material determines the quality of the good and bad. From the point of view of the material of the product, at present, the main materials of the LED lamp strip are PVC, PVC+copper wire, silicone sleeve, rolled copper, aluminum and copper wire. The product uses different materials and has a different service life. Taking PVC as an example, PVC is a kind of plastic decorative material. It is made of polyvinyl chloride resin as the main raw material. It is characterized by clear quality, heat insulation, flame retardant, acid and alkali resistance and corrosion resistance. At the same time, its dielectric property is good. Durable, anti-aging, easy to weld and bond, smooth surface, bright color, very decorative, decorative application. From the table, we can see that the LED light strips of Op, Auman and Foshan are all made of PVC. The same side lighting uses a silicone sleeve. It is reported that the advantage of the silicone sleeve is that it has high softness, good elasticity, ozone resistance, voltage resistance, kink resistance and no deformation, long service life and good flame retardancy. The quality of the material determines the pros and cons of the product. In the investigation of the brand awareness of the terminal lights, Auman ranked first with overwhelming advantages, and Opus and Tongfang Lighting also ranked among the forefronts, which fully supported the importance of LED lamp materials on product quality.
Light effect and signifying effect are more and more important. The ratio of the total luminous flux (lumens, brightness) emitted by the light source to the electrical power (watts) consumed by the source is referred to as the efficacy of the source. The higher the luminous efficiency value of the product, the stronger the ability of the lighting fixture to convert electrical energy into light energy, that is, the greater the energy saving of the lighting fixture when the same brightness is provided; the lighting of the lighting fixture under the same power The stronger the sex, the greater the brightness. Among the more than 20 companies surveyed, 8W LED strips were used as an example to compare the luminous flux of some enterprise LED strips: Among them, the 8W LED strips used in the 8W LED strips are 5730, and the luminous flux is 350lm/m. Ouman's lamp beads are 5050 and 2835, and their luminous fluxes are 400 lm/m and 200 lm/m respectively; the 8W LED strips of Foshan Lighting and Lida Lighting are all used for 5050, and their luminous flux is 400 lm. /m and 600lm/m.
The ability of a light source to develop an object is called color rendering, and is a comparison of the appearance color of an object with a reference to the same color temperature or a reference light source (incandescent or painted). In the 8W LED strip, Op's color rendering index is 75, Auman's is 80, Foshan lighting is slightly lower, 70, and the big lighting is 72.
The LED lamp strip is neglected in the selection of materials and the control of the production process. Therefore, the LED lamp has insufficient brightness and low index. In addition, many low-voltage LED strips are in a vicious price competition cycle, destroying the LED strip. The overall quality image of the segment.
The potting glue is right, it’s “madeâ€
With the popularity of LED flexible strips and the increase in market capacity, choosing a suitable LED soft strip encapsulant has become one of the most headaches for many LED strip manufacturers. It is reported that there are three kinds of potting glues, such as epoxy resin potting glue, polyurethane potting glue and silicone potting glue.
Among them, although the epoxy resin potting glue has better light transmittance and better stacking effect, the cured LED light strip can be bright and curved. However, it can only be used in the range of -50C to 550C. It is prone to toughness deterioration at high temperatures. In many cases, when the temperature exceeds 600C, the soft strip rubber softens, causing the colloid to be easily broken. At the same time, when the temperature is lower than -50C The colloid becomes hard and brittle, and the phenomenon of colloidal peeling and embrittlement fracture occurs when the light bar is slightly shaken; after the lamp is lit for 400-700 hours for a long time, the epoxy resin gel above the lamp bead turns yellowish brown, causing the light. The brightness decreases and the color temperature changes.
The light transmittance of polyurethane potting adhesive is between 85-92%. The cured light strip has good flexibility. After curing, the colloid can be used for a long time between -250C and 950C. However, the hardness of polyurethane colloid cannot be achieved. Very low, the product can only be applied to Epoxy or semi-casing soft strips. As the temperature decreases, the flexibility of the light bar changes greatly; when filling, the surface temperature and environmental humidity of the FPC are relatively high. If the humidity is too large, the surface of the product is prone to white fog and insufficient adhesion. For long-term use outdoors, colloids usually appear yellowing in 2-3 years.
Silicone potting compound is the most popular potting glue on the market. After curing, the hardness of the gel is adjustable. It can be used as both a jelly-type gel and a ShoreA 30-degree hard rubber. So silicone Potting glue can be used for Epoxy type light strips, semi-casing type light strips, and full-casing type light strips. After curing, the colloid can be used between -450C and 2000C, and The change of temperature, the mechanical and physical properties and optical properties of the product will not change significantly, and it is very suitable for use in cold regions such as Russia, Northern Europe and North America. In addition, silicone potting strips are resistant to ozone, UV, acid and alkali, and can be kept yellow for a long time in outdoor use. However, silicone potting adhesives also have lower adhesion to FPC than epoxy and stack. Slightly lower.
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