What is the difference between COB and SMD?
How shall we choose Spotlight？
In your knowledge, you might know SMD LED Spotlight source, in fact, what we call COB LED Spotlight source is an upgraded version of the SMD light source, then you will be confused, What is the difference from, We would like to tell you what is COB light source, SMD light source and the difference between both.
A COB Spotlight source
COB LED spotlight source is the chip on the entire base plate for bonding package, that is, in the base plate on the N chip succession integrated together for packaging. Mainly used to solve the problem of small power chip manufacturing high-power LED lights, can disperse the chip heat dissipation, and improve the luminous efficiency while improving the glare effect of the LED lights. COB luminous flux density is high, less glare light soft, issued by a uniform distribution of light surface.
COB LED spotlight source is a high luminous efficiency integrated surface light source technology in which the LED chip is directly affixed to a high-reflectivity mirror metal substrate, this technology eliminates the concept of the bracket, no plating, no-reflow, no SMD process, so the process is reduced by nearly one-third, and the cost is also saved by one-third.
COB LED spotlight source can be simply understood as a high-power integrated surface light source, which can be designed according to the product shape structure of the light source light area and shape size.
COB LED spotlight source product features.
Electrical stability, circuit design, optical design, and heat dissipation design are scientific and reasonable.
Adopt heat sink process technology to ensure that the LED has an industry-leading thermal lumen maintenance rate (95%).
Facilitate the secondary optical matching of products to improve lighting quality.
High color rendering, uniform luminescence, no light spot, health, and environmental protection.
Simple installation, easy to use, reduces the difficulty of the lamp design and saves lamp processing and subsequent maintenance costs.
B, SMD LED Spotlight Source
SMD LED spotlight is the meaning of surface mount light-emitting diodes, SMD helps to improve production efficiency, as well as different facilities applications. It is a solid-state semiconductor device, which can directly convert electricity into light. It has a voltage of 1.9-3.2V, with red light, yellow light voltage is the lowest, the heart of the LED is a semiconductor wafer, one end of the wafer attached to a holder, one end is negative, the other end is connected to the positive end of the power supply so that the entire wafer is epoxy resin encapsulated. A semiconductor wafer consists of two parts, one is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, on this site is mainly electrons. However, when these two semiconductors are connected, a P-N junction is formed between them. When the current through the wire acts on this wafer, the electrons will be pushed to the P region, in the P region, the electrons and holes compound, and then will be issued in the form of photons of energy, which is the principle of the LED light. And the wavelength of light is the color of light, which is determined by the formation of the P-N junction material.
C， SMD LED Spotlight source and COB LED Spotlight source comparison analysis
Traditional LED “LED light source discrete devices → MCPCB light source module → LED lamps and lanterns”, mainly because there are no ready-made suitable core light source components and take the approach, not only labor-intensive and time-consuming, and high cost.
COB package “COB spotlight source module → LED lamps and lanterns”, multiple chips can be directly packaged in the metal-based printed circuit board MCPCB, through the substrate directly heat dissipation, saving the LED primary packaging costs, light engine module production costs and secondary light distribution costs. In terms of performance, through reasonable design and micro-lens module, the COB spotlight source module can effectively avoid the existence of discrete light source device combination of a point light, glare, and other drawbacks; can also be added to the appropriate combination of red chips, without significantly reducing the light source efficiency and life of the premise, effectively improve the color rendering of the light source.
COB’s relative advantages are.
Manufacturing efficiency advantages COB package in the production process and the traditional SMD production process is basically the same, in the solid crystal, welding line process and SMD package efficiency are basically equivalent, but in the dispensing, separation, spectroscopy, packaging, COB package efficiency, much higher than SMD products, the traditional SMD package labor and manufacturing costs account for about 15% of the cost of materials, COB package labor and manufacturing costs account for about 10% of the cost of materials. The labor and manufacturing cost of the traditional SMD package is about 15% of the material cost, the labor and manufacturing cost of the COB package is about 10% of the material cost, and with the COB package, the labor and manufacturing cost can be saved by 5%.
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