Characteristics of LED lamp beads
1. voltage: LED lamp beads use low-voltage power supply, and the power supply voltage is between 2-4V, which varies according to different products, so it is driven by a specific high-voltage power supply; Safer power supply, especially suitable for public places.
2. Current: The working current is 0- 15 mA, and the brightness becomes brighter with the increase of current.
3. Efficiency: Compared with incandescent lamps with the same light efficiency, the energy consumption is reduced by 80%.
4. Applicability: Very small, each unit LED chip is 3-5mm square, so it can be made into devices with various shapes and is suitable for changing environments.
5. Response time: The response time of incandescent lamp is millisecond, and that of LED lamp is nanosecond.
6. Environmental pollution: no harmful metal mercury.
7. Color: the color can be changed by changing the current, and the energy band structure and band gap of the material can be easily adjusted by chemical modification of the light-emitting diode, so as to realize multicolor emission of red, yellow, green, blue and orange. For example, an LED that is red at low current can turn orange, yellow and finally green with the increase of current.
LED lamp bead price
The price of led lamp beads can be regarded as a single power. At present, the price of LED bulbs below 3w is about 1 yuan /w, and the price of lamps above 5w is about 1-2 yuan /w! Of course, some brands, first, high-quality LED light beads are more expensive, with hundreds or thousands. So why are their prices so high? Actually, there is a reason. Let's take a look at the factors that affect the price of LED lamp beads.
Influencing factors of LED lamp bead price
1.LED size
Different sizes of LEDs have different prices. For example, the prices of 0603LED and 12 10, that is, 3528LED are quite different; The price difference between 12 10 and 5050 LED specifications has reached a new level. Don't just look at the price when buying LED beads. In order to buy cheap LED lamp beads, we should make a comprehensive evaluation from the following aspects.
2.LED lamp bead chip
There are domestic and Taiwan Province chips, as well as imported chips (including American chips, Japanese chips, German chips, etc. ). Different chips have different prices. At present, American chips are the most expensive, followed by Japanese chips and German chips, while Taiwan Province chips with the lowest price have a slightly poor heat dissipation performance. What chip is used specifically? What kind of effect should it achieve? Know clearly before buying.
3.LED package
It is divided into resin encapsulation and silica gel encapsulation. The price of resin packaging is cheaper. Everything else is the same. Silica gel packaging has good heat dissipation performance, so the price is a little more expensive than resin packaging.
4.LED color consistency
At present, there are many packaging factories in China. Large and small add up to thousands, of course, there are differences in strength. There are many small packaging factories that don't have color separators, or they don't separate colors, or they can't be distributed, so the quality is difficult to guarantee. The color consistency of LEDs without light splitting is poor, and the effect is not so good after lighting on LED beads, of course, the price difference is also relatively large.
5.LED welding effect
The assembly of LED lamp beads can be divided into manual welding and machine welding. Manual welding is to use a soldering iron and use the most primitive method to weld. The appearance of the products in this operation mode is ugly (the solder joints are different in size), and the electrostatic maintenance measures are not good, and many LED chips are broken down, which leads to the phenomenon that they are slightly bright or not bright after power-on. Machine welding is soldering with reflow soldering, but machine welding is different. Not only is the product beautiful after welding (the solder joint size is uniform, the solder joint is smooth, there is no flux residue, and the LED package is intact), but the chip will not be burned by static electricity. At the same time, the position and direction of LED are beautiful. This can be seen directly from the appearance.
6.FPC materials
FPC can be divided into calendered copper and coated copper. Copper plating is cheaper, and calendered copper is more expensive. Copper-plated pads are easy to fall off when bent, but calendered copper is not. What kind of FPC material to use depends on the promoter's own decision according to the use environment.
Has FPC passed the environmental protection certification and UL certification? Whether there is a patent for LED, etc. No, the price is low. The price with certification and patent is more expensive.
7.LED brightness
The price of LEDs with different brightness is different. The price gap between ordinary brightness and high-brightness LED is still quite large. Therefore, when buying, you must clearly know what kind of brightness you need, so that you can accurately locate your products.
8.LED color
Different colors. The price is different. Red and green are more expensive than other colors because of difficulties in color matching and color separation. Red, yellow, blue and other colors are easier to separate and more consistent, so the price is slightly cheaper. Special colors such as purple and brown are the most expensive because of color matching.