What are Chip-on-Board (“COB”) LEDs?
Chip-on-Board or "COB" refers to the mounting of a bare LED chip in direct contact with a substrate (such as silicon carbide or sapphire) to produce LED arrays. COB LEDs have a number of advantages over older LED technologies, such as Surface Mounted Device ("SMD") LEDs or Dual In-line Package ("DIP") LEDs. Most notably, COB technology allows for a much higher packing density of the LED array, or what light engineers refer to as improved "lumen density". For example, using COB LED technology on a 10mm x 10mm square array results in 38 times more LEDs compared to DIP LED technology and 8.5 times more LEDs compared to SMD LED technology (see diagram below). This results in higher intensity and greater uniformity of light. Alternatively, using COB LED technology can greatly reduce the footprint and energy consumption of the LED array while keeping light output constant. For example, a 500 lumen COB LED array can be many times smaller and consume substantially less energy than a 500 lumen SMD or DIP LED Array.
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The other big advantage of using COB LED technology lies in the fact that COB devices have only 1 circuit and 2 contacts for the entire chip regardless of the number of diodes. This single circuit design, regardless of the number of diodes on the chip, leads to simplicity for the rest of LED device.
The advantages of Chip-on-Board LED arrays include:
- Compactness due to the small size of chip
- High-Intensity, particularly at close distances
- High-Uniformity, even at close working distances
- Design Simplicity because only 1 circuit and 2 contacts are required
- Superior Thermal Performance for increased life, stability and reliability
Why are COB LEDs so important when running on battery power?
When designing a battery-powered lighting system, there has always been a trade-off between the amount of high-quality lumen output (i.e. brightness) and length of runtime via battery operation. Historically, the more high-quality brightness desired, the shorter the runtime (assuming you are using the same size battery). However, with the recent development of COB LED technology, this tradeoff has become much less of an issue. For the first time, very low wattage COB LEDs can output extremely high-quality, ultra-bright light. As a result, a relatively small and lightweight lithium-ion battery pack can power a COB LED based light system for very long periods of time. In fact, our 6W COB LED Trade Show Light will run 14-15 hours using our very small and light weight (1.25lbs) rechargeable Mobile Power Center. High quality light output over extended periods of time using a relatively small battery was simply not possible just a few short years ago! This is why COB based LED lights were the only real choice we had when designing our ultra-bright, ultra-efficient light systems. As such, Silicon Lightworks exclusively uses COB LED technology in its full line of trade show exhibit lighting.
In summary, chip-on-board LEDs are the latest and most advanced technology on the market today. Simply put, COB LEDs are brighter, consume less power, and output a higher quality beam of light compared to older LED technologies found in most other trade show lighting today. The next time you are in the market for exhibit lighting, insist on COB LED technology!
What is a COB LED?
How Long Do COB LEDs Last?
When Using Battery Power, Why are COB LEDs So Important?
What are the Differences between Normal Led and COB LED?
Differences between COB LEDs and SMD LEDs
Why Choose the COB LED?
The Advantages and Disadvantages of COB LED
Multiple Uses of COB LED
Conclusion
LED lights are continually being upgraded to increase their usability, adaptability, and energy efficiency. When compared to standard incandescent lights, LED lights are extremely popular since they may last up to 25 times longer while using less power.
COB and SMD LED lights are two types of LED lights available, which are the two primary sources of light these days. Both of these components create high-quality illumination and have a lengthy life expectancy, as well as the highest efficiency to date.
In this case, we will talk about COB LEDs, which are the latest in the LED industry and provide a number of advantages over the previous options.
What is a COB LED?
One of the most recent developments in the world of LEDs is "Chip on Board" (COB) technology. When contrasted to other standards, we can consider it quite recent and innovative.
COB lights are made up of an arrangement of LED chips that are tightly packed and attached to a silicon carbide base. As a result, one huge LED chip with outstanding illumination uniformity is created, making it perfect for many professionals such as filmmakers and photographers.
Generally, COB chips feature nine or even more diodes. Irrespective of the number of diodes, COB chips only have two contacts and one circuit. On a big chip, this can result in more powerful lighting of up to 250 lumens (at 20mA). The panel-like aspect of COB LED lights is due to the chip's basic circuit design.
COB LED lights, unlike SMD LED lights, cannot be utilized to make color-changing lamps or lights. That is due to the fact that there are only two contacts and one circuit. To achieve the color-changing illusion, several modification channels are needed. COB LED lights are hence effective in single-color applications.
How Long Do COB LEDs Last?
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Types of Facade Lighting and Applications: The Definitive ...How much cheaper are LED light bulbs?The longevity of a COB LED is determined by how they are used as well as how much heat they are exposed to. A COB LED has an average rated lifetime of 50,000 hours. That is assuming a person uses them for 12 hours a day on average.
When Using Battery Power, Why are COB LEDs So Important?
There has always been a trade-off between both the amount of high-quality lumen output (brightness) and the duration of runtime through battery operation when building a battery-powered lighting system. If you utilize the same size battery, the more high-quality illumination you want, the shorter the runtime will be. That has become considerably less of a concern with the emergence of COB LED tech.
COB LEDs with little power can produce exceedingly high-quality, ultra-bright light. As a consequence, a COB LED-based lighting system may be powered for extended periods of time using a relatively tiny and lightweight lithium-ion battery pack.
What are the Differences between Normal Led and COB LED?
To begin, a basic understanding of Surface-Mounted Device (SMD) LEDs is required. They are by far the most widely used LEDs on the market today. The LED chip is firmly fused to a printed circuit board and is widely utilized due to its adaptability, even in the notification light on the smartphone. The amount of diodes and contacts on SMD LED chips is one of their most distinguishing features.
More than two contacts are possible on SMD LED chips. On a single chip, up to three diodes can be found, each with its own circuit. An anode and cathode would be used in each circuit, resulting in 2, 4, or 6 connections on a chip.
Differences between COB LEDs and SMD LEDs
SMD LED chips can include up to three diodes on a single chip, each with its own circuit. In a chip of this type, each circuitry contains a single anode and one cathode, resulting in 2, 4, or 6 connections. COB chips typically have nine or even more diodes. Furthermore, irrespective of the number of diodes, COB chips have two contacts and one circuit. COB LED lights have a panel-like appearance, whereas SMD LED lights would seem like a collection of smaller lights due to this straightforward circuit design.
The SMD LED chip could have a red, green, and blue diode. By employing those three diodes, you can generate any hue simply by altering the output level. But there are just two contacts and one circuitry on COB LED lights. They can't be utilized to create color-changing lights or bulbs. To achieve the color-changing appearance, multiple channel modifications are needed. As a result, COB LED lights are effective in single-color applications but not in multi-color uses.
The luminosity of SMD chips is well known, and they may generate 50 to 100 lumens per watt. COB is noted for its high heat efficiency and lumens per watt ratio. With a minimum number of 80 lumens per watt, COB chips could emit more lumens with less power. It can be found in a variety of bulbs and applications, such as a point-and-shoot camera or your phone's flash.
In SMD LED chips, a smaller current capacity is necessary; however, in COB LED chips, a large current capacity external energy source is needed.
Why Choose the COB LED?
COB LED lights, as a basic guideline, are higher-quality light emitters. This is due to the fact that they use reflectors to create concentrated and regulated light. They also lack the frosted lens that comes standard with SMD LED lights.
COB LEDs are a higher-end LED that has a more structural look. In case you intend to live with your LED bulbs for a long time, a COB is a way to go; if you are located in an investment property, SMD will suffice.
You should expect brighter, clearer lighting. COB LED lights, for example, are useful in high-ceiling areas.
The Advantages and Disadvantages of COB LED
Advantages of COB LED
- * Because of the multi-diode incorporation, there is a lot of light.
- * It produces more lumens while using less energy.
- * Due to the limited light emission zone, the device is small in size. As a consequence, the lumen per square centimeter/inch has grown significantly.
- * To active the many diode chips housed in COB LEDs, a single circuitry with only two connections is used. As a result, there are fewer parts per LED chip that are necessary for proper performance. Furthermore, by reducing the number of components and eliminating the standard LED chip architecture packing, the heat created by each LED chip can be decreased.
- * Due to the extreme ease of installation in an outside heat sink, the entire temperature range of the entire assembly is lower. When you keep things at a set temperature, they last longer and are more reliable, which saves you money.
- * Clarity is improved, and efficiency is boosted.
- * Since it can cover a big area with one chip, it has a huge focusing area.
- * Excellent anti-vibration properties
Disadvantages of COB LED
- * A well-engineered outside power source. That occurs since it requires a steady current and voltage to avoid damaging the diodes.
- * A well-designed heat sink is very important. If the heating element is not properly placed, the diode will be destroyed due to overheating. Due to the highly focused light waves emitted from a limited area, a considerable amount of heat is created.
- * Lighting fixtures with cob chips have a lower repairability. That is because in case one of the solitary diodes in a COB is damaged as a result of a mechanical malfunction, the entire COB led must be substituted with a newer one. In the case of SMD LED, however, if one fails, it is simple to change it and get it back to operate at a lower cost.
- * Color selection is limited.
- * More expensive than SMD chips.
Multiple Uses of COB LED
COB LEDs have a wide range of applications, extending from residential to industrial utility, with some of them being:
- * COB LEDs would be used primarily as solid-state lighting (SSL) substitutes for metal-halide bulbs in street lighting, high-bay lighting, downlights, and high-output track lights.
- * They are useful in LED lighting fixtures for placement in living rooms and huge halls because of their wide-angle beam.
- * High lumens at night time are required in spaces such as a playground, gardens, or a large stadium.
- * Additional applications incorporate basic lighting for passageways and corridors, fluorescent lighting replacement, LED lamps, light strips, smartphone camera flash, and so on.
Conclusion
COB LEDs are becoming more popular in lighting applications as designers discover the advantages of employing them over typical standard LEDs. It's difficult not to take into account them for any led light application structure because of:
- * Their ability to cram more LED sources into a smaller area, resulting in higher lumen output
- * Their ability to transmit heat to a heat sink more efficiently
- * Their wider field of view
- * Their lower light loss
- * Their lower failure rates are due to their more straightforward construction
COB LEDs are the most recent and advanced tech available today. Simply said, they are brighter, use less electricity, and provide a higher-quality beam of light than previous LED technology now used in most trade show illumination.
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