1: What is LED
Light source after incandescent, fluorescent, to the LED development process, LED has a low energy consumption, high brightness, non-mercury and non-toxic, long life, instantaneous start, plasticity and other advantages, has replaced the traditional light source, in this article does not do too much reiteration of the traditional light source.
The so-called LED that light-emitting diode, is a semiconductor light-emitting material, when the two ends plus forward voltage, the carrier in the semiconductor compound caused by photon emission and produce light.LED can directly emit red, yellow, blue, green, green, orange, purple, white light.
2: The structure of LED lamp beads
LED lamp bead structure diagram
1, a LED light source by the bracket, chip, glue, phosphor, wire Composition
2, LED bracket is generally made of copper (also iron, aluminium and ceramics, etc.), because the copper conductivity is very good, it will be inside the lead, to connect the LED lamp beads inside the electrode.
3, high-end light source wire are used 0.999 pure gold wire, diameter: 0.8mil, 1.0mil. some of the pursuit of low-cost manufacturers with copper-doped alloy wire to do.
4, phosphor is to play the role of regulating the colour temperature of the light source .
5, common high-end chips are: U.S. CREE (Corey), Bridgelux (Pratt & Whitney); Japan Nichia (Nichia), Germany Osram Osram; Taiwan: Epistar.
Low-end chips: Guangjia, Tai Valley, light macro, the new century, light, Baihong, light lei; mainland China: Woodland Forestry, Xiamen Sanan, Shanghai Blu-ray, Shilan Mingxin, Dalian Lumi ……. (Mainland China is now mainly used in Taiwan chips)
LED lamp bead encapsulation after the formation of the lamp bead can be removed from the bracket, the lamp bead two copper feet that became the positive and negative poles of the lamp bead, used for welding to the LED lamps and lanterns or other LED products.
Third: common LED light source
The market often circulate LED models are 2835, 5050, 5730, 5630, 3030, 4040, 7030 and integrated COB and high-power lamp beads, distinguish between the light source model is to patch the length and width of the name, SMD SMD as an example of the following picture for the 2835 patch, that is, the width of 2.8 length of 3.5, this type of light source is commonly used in the LED light bulbs, downlights, spotlights, ceiling lamps, light bands, tubes and so on. Light tubes and so on. Each power about 0.1W-1W.
High-power lamp beads common 1W, 2W, 3W each, commonly used in spotlights and outdoor lighting.
COB integrated light source common 5-50W each, commonly used in spotlights, track lights and floodlights and other high-power lamps.
COB integrated light source
Four: often said that the LED parameter indicators
1, colour temperature: light contains colour components of a unit of measurement, unit K (Kelvin), the smaller the value of the colour is more red, the larger the value of the colour is more blue, the middle value of the white, the normal use of the light colour range of about 3000K-6500K, i.e., the warm white light and white light, the most popular neutral light is now about 4000K, (poor-quality light sources are very large colour difference, common warm white light reddish, blue) (inferior light source colour difference is very big, common warm white light reddish, positive white light bluish)
- luminous efficiency: the luminous flux emitted by the light source and the ratio of power consumption, called luminous efficiency, the unit is lumen LM / W (lumens / watt). Different light sources emit the same luminous flux, the less power consumed, the higher the luminous efficiency .
- Brightness: defined as the brightness of the light source unit, that is, the luminous intensity per unit of projected area. The unit of brightness is candela / square metre (cd / m2) brightness is the human perception of the intensity of light. It is a subjective amount.
4, illuminance: refers to the luminous flux of visible light received per unit area. Unit lux (Lux or lx). Used to indicate the intensity of light and the surface area of the object is illuminated by the amount of the degree.
5, colour rendering index: (the simplest understanding of the true colour of the reduction of the item degree. The higher the colour rendering index, reflecting the more realistic colour, usually high-quality LED light source colour rendering index of up to 85 or more, the definition of daylight and incandescent lamps for 100). The ability of a light source to reveal colour to an object is called colour rendering, and is achieved by comparing the appearance of the colour of an object with a reference or benchmark light source (incandescent or daylight) of the same colour temperature. The spectral content of the light emitted by the light source to determine the colour of the light.
6, light decay: LED light failure refers to the LED after a period of time after the light, its light intensity will be lower than the original light intensity, and the low part is the LED light failure. According to international practice, 30% of the light failure can be identified as product failure, many low-quality products less than half a year has exceeded this value, affecting the light failure of a number of factors, the quality of the light source itself, the driver, heat dissipation are important factors affecting the light failure.
Five: factors affecting the quality of LED
1, the advantages and disadvantages of the selected raw materials.
2, whether the encapsulation process is perfect (there is no dust, components fit perfectly), heat dissipation copper pad material.
Six: life: the theoretical life of high-quality LED 100,000 hours!
Why is the service life of some LED lamps and lanterns is very short or even less than a year, the relationship between the lamps and lanterns of the life of many factors, such as: the quality of the drive power itself, the drive power and the matching degree of light source, lamps and lanterns of the assembly process, and so on.
Today introduced the LED light source, I believe we have a preliminary understanding of the LED light source, there are questions you can always click on the consultation recolux