FAQ

LED light sources can be classified into seven categories based on packaging methods:
1) DIP LED (Dual In-line Package): Traditional and cost-effective, mainly used in indicator lights, traffic signals and advertising light boxes; Common sizes: 3mm, 5mm.
2) High Power LED: High brightness "point light source," typically packaged with EMC brackets (1W/3W/5W).
3) SMD LED (Surface Mount Device): Wire bonding LED packaging technology, the most versatile and has the highest market share; Models like 2835, 3030, and 5050.
4) COB LED (Chip on Board): Integrated high brightness LED solution for high-end lighting, uniform light, no spot, no glare, no dark areas; Including wire-bonding COB LEDs (Models like 1414, 1919, 2828) and flip chip COB LEDs.
5) Flip Chip COB LED: Advanced and upgraded COB technology, no gold wire packaging, stronger reliability, known for superior heat dissipation; Models like 4046, 4640, 7660.
6) DOB LED (Driver on Board): Integrated LED module of "LED chips + driver", cost optimization solution; can work without any extra led driver under AC220-240V or AC110-130V; Divided into two categories: AC SMD LED like 7W/9W/12W DOB LED module for Bulb light; AC COB LED like 7440, 4075, 4060.
7) CSP LED (Chip Scale Package): "Micro LED packaging technology" used in extremely small volume with high brightness applications such as TV backlighting and mobile devices; Divided into two categories: Mini LED and Micro LED.

SMD stands for "Surface Mount Device", which is simply an LED that can be directly attached to the surface of a circuit board without the need for pins. It has a small volume (common sizes such as 2835, 3030, 5050), much higher light efficiency than DIP (up to 100-150lm/W), and can be made into single or multiple combinations to meet different power requirements.
Typical applications: LED boards for bulb lights, ceiling lights, and strip lights, panel lights, LED tubes.
B2B customers should know its characteristics below: mature technology, high cost-effectiveness, flexible design, suitable for mass production; But the disadvantage is that its single power is very small (usually 0.2-1W). If making high lumens or high power lamps (such as Tower chandeliers, mining lights, fishing lights, stage lights, LED grow lights), multiple pieces need to be spliced, which may cause problems such as poor heat dissipation, gold wire collapse, and uneven light spots.

COB, means "Chip on Board", is the process of directly attaching multiple LED chips onto the same substrate, and then covering them with encapsulated silicone to form a "light-emitting surface" rather than a "single led bead". Its advantages are obvious: large light-emitting area, no "dark area" caused by SMD splicing, uniform light, no spot, no glare; And the substrate is usually made of metal or ceramic materials, with high thermal conductivity, good heat dissipation, and can withstand higher power (it can achieve 10-200W for one single COB LED), with a lifespan about 20% longer than SMD LED.
Typical applications: Mall spotlights, indoor downlights, outdoor floodlights, par lights, industrial lights, street lights.

DOB LED ( Driver On Board), is a form of led light source that integrates LED driving circuit and LED light-emitting chips directly on the same PCB circuit board - different from the traditional design of "independent driver + LED light source", it is equivalent to integrating the two core components of "led light source" and "driver" on one substrate, forming a highly integrated whole. Its characteristics are: work directly under AC220-240V or AC110-130V input voltage, small size, light weight, simplified production process, cost reduction and efficiency improvement, and simple maintenance.
Typical applications: bulb lights, led tube lights, panel lights, floodlights, spotlights, landscape lights.

AC COB LED, actually, it is the driverless COB LED developed using the "Driver On Board" concept from conventional DC COB LED, which integrates the LED driver circuit and COB light-emitting chip directly on the same PCB circuit board. Its characteristics are: direct input of AC voltage for operation, saving the cost of LED driver, simplifying lamp assembly, improving production efficiency, smaller size, simple maintenance, and reducing maintenance cost. It is the better COB LED solution with cost reducing and efficiency increasing than conventional COB light sources. However, although AC COB belongs to a type of DOB LED, what people often refer to as DOB specifically refers to AC SMD LED.
Typical applications: spotlights, tube lights, street lights, floodlights, landscape lights, plant grow lights, signal lights, emergency lights, fish gathering lights.

Flip Chip COB LED is an upgraded version of conventional wire-bonding COB, using the Flip Chip process to eliminate the drawbacks of gold wire connections and directly conduct through the electrodes (solder joints) in the bottom of chips.
Core technology: flip chip bonding electrodes, without gold wire packaging.
Advantages:
1）No risk of gold wire breakage, collapse, virtual welding, or detachment, higher reliability;
2）Lower thermal resistance and smaller light attenuation;
3）Support higher working current (such as constant current driving above 2.0A);
4）Longer lifespan (up to 50000 hours or more).
Applicable scenarios: high power floodlights, spotlights, street lamps, stage lights, industrial lighting, high-end COB lighting, drone lighting.
Flip chip COB LED is the mainstream trend in the current high-end lighting market, especially suitable for countries and regions with strict requirements for lamp stability and reliability.

Wire Bonding LED is a type of LED packaging structure that uses extremely thin metal leads (similar to "wires", usually gold or alloy wire) through the "wire bonding" process to connect the electrodes (positive/negative) on the surface of the LED chip to the solder pads on the packaging substrate (or led bracket), allowing current to flow into the chip from the external circuit and excite the chip to emit light. It is currently one of the most mature and widely used packaging technologies in the field of small and medium power LEDs.
Brief description: Wire Bonding = Chips + Gold Wire Connection + Encapsulated Silicone Protection.
Wire-bonding technology is widely used in LED products such as SMD, DIP, and most COB.

For traditional COB, the LED chip faces upwards and is connected to the substrate through gold wires, which poses a risk of wire breakage. Flip Chip COB inverts the electrodes of the chip and directly conducts with the substrate through the solder joints on the bottom, achieving a "no gold wire" structure.
Five core advantages of Flip Chip COB LED:
1) Gold wire free design greatly improves reliability;
2) Support higher working current, higher light efficiency;
3) Lower thermal resistance, better heat dissipation performance;
4) More uniform light，no shadow caused by gold wires;
5) Smaller volume, more compact and flexible design.

DOB stands for Driver on Board, which is an LED technology that integrates LED chips and driver circuits directly onto the same circuit board.
Six core advantages of DOB LED:
1) Removing external driver, simplifying the lamp structure and making it thinner and lighter;
2) Simplify the assembly process, reduce warehousing and labor cost;
3) Reduce welding and connection points of wires, increase the overall protection level of the lamp, and enhance reliability;
4) Easy replacement and low maintenance cost;
5) Low customization cost and strong size adaptability;
6) Support intelligent dimming to meet diverse needs.

WELCOB is an LED assembly factory established in 2013 in Shenzhen, China, with over 12 years of professional experience in LED manufacturing, and was awarded the honor certification of China's National high-tech enterprise in 2021.

Yes, we are an LED manufacturer with a professional team of engineers with over 20 years of LED research and development experience, capable of providing customized LED light source solutions to meet various customer needs.

Of course! If you purchase in bulk, we support printing your trademark on the PCB board. Please contact us for details.