Oct. 28, 2024
LUXEON CoB Finder
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A CoB LED (or chip-on-board LED) is a single device with many LED chips mounted on a thermally efficient substrate placed below a uniform phosphor coating.
Anyone who walks through a store or home with recessed or track lighting likely experiences light from a chip-on-board LED (CoB). CoBs are widely used because they emit a bright white light output from a compact light source and are very efficient in a broad range of applications.
So what is a CoB LED, and how is it different from other types of LEDs?
CoB (chip-on-board) refers to the way in which the LED unit is constructed. The basic elements of white CoB LEDs are:
A CoB LED is a single device with many LED chips mounted on a thermally efficient substrate, or board. Each chip is a bare die &#; that is, the chip does not have its own leadframe, phosphor coating or lens. This means that the chips can be mounted extremely closely together on the substrate. The close placement of the LED chips allows for high intensity or light density to be emitted from a smaller area than is possible with single packaged LEDs. The CoB LED manufacturer then applies a uniform phosphor coating to the entire array of chips to convert the blue light to the required white color temperature.
An interactive 3D diagram of a CoB LED.A single CoB LED can contain hundreds of chips forming a dense array. This dense array enables a CoB LED to produce more light output from a smaller area than is generally possible with an array of packaged LEDs.
Using a single LED can result in simpler design and product as well as providing optical advantages for uniform light and efficient optics.
Electrical design is simpler because the CoB LED only requires a single two-wire power supply to the entire array of chips. The positive and negative terminals on a CoB LED are clearly visible in the picture of LUXEON CoB Core Range products above. By contrast, an array of packaged LEDs requires dedicated power supply traces to be routed on the PCB to each LED unit.
Production is simpler because the number of units to be soldered to the board will be lower if a CoB LED is used instead of an array of packaged LEDs.
Optically, a broad range of optics, usually reflectors, can be used with CoBs of different sizes to determine the direction and width of the beam such as with a spot or flood lamp.
Finally, a CoB LED&#;s color is potentially more consistent because a single phosphor coating is applied to the entire array of chips, whereas in an array of packaged LEDs, each LED unit has its own phosphor coating.
An example of CoB LEDs of various sizes is shown below.
Lumileds LUXEON CoB Core Range &#; High Density CoB LEDs.Lumileds supplies a comprehensive range of CoB LEDs for general lighting, as well as CoB LED products optimized for retail and hospitality lighting. More information can be found at lumileds.com/products/cob-leds/.
LED COB, with LED standing for light-emitting diode and COB for chip on board, is a kind of lighting source using COB technology to improve light efficiency and reduce loss.
The LED COB chip-on-board technology is one of the most cutting-edge LED technologies in the lighting industry. It is an assembly method that directly mounts an array of diodes on a single substrate or a printed circuit board. Thanks to the assembly style, it appears like a lighting panel. No matter how many diodes are there, this design needs only one circuit and two contacts. Such configuration can accommodate nine or even more diodes on one chip, thus taking up less place while producing more brightness. Compared with older lights, it is relatively compact, efficient, and bright.
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The gap between each diode is fairly narrow that the whole size of the LED COB light is quite compact. This provides great flexibility for utilizing it in diverse places.
In comparison to older lightings, COB LED chip has a higher watt ratio. It produces a large number of lumens per watt that can reach 100 while traditional one can only offer 20-50 lumens per watt.
The brightness comes from it is comparatively uniform. When illuminating a subject, it brings a clean and distinct shadow outline. This makes it well suited for creating special lighting effects in shooting, thus it gains popularity from photographers and filmmakers.
Because an array of light emitting diodes is mounted on one substrate, the density is higher than other LED chips, which means strong light intensity.
Because of design simplicity, COB light contains fewer components than traditional ones. Hence, the heat generated by the components is relatively low compared to conventional lights.
When talking about LEDs, what comes to people's mind is probably the Dual In-Line Package LED that consists of a chip built in a cylindrical hard plastic. It is the most conventional one but it is bulky and not efficient.
Actually, thanks to the rapid technology development, more efficient and more powerful LED COB and LED SMD become two main types of bulbs now. With SMD standing for Surface-Mounted Device, SMD LED light is composed of diode chips fused permanently on the circuit board. These two typical modules are often mentioned in the same breath. However, there are still many differences between them.
Chip LED COB can accommodate the LED COB array of more than 9 diodes while SMD LED can contain only 3 diodes. This accounts for the fact that the illumination of it is better than the one of surface-mounted device.
The former is generally capable of emitting 100 and above lumens per watt while the latter produces 50 to 100 lumens per watt.
LED COB panel merely has one circuit and two contacts, conducing to great simplicity and low failure rate for the whole device. Owing to the single circuit configuration, it needs multiple channel adjustments to realize the flexible effects of color. By contrast, SMD light has up to three individual circuits and six contacts on a single chip, which makes it not as compact as LED COB chip but capable of producing RGB results within one chip.
By the way, RGB stands for Red, Green, and Blue colors, which are added in a variety of ways to create multiple displays. In particular, the full intensity of each gives a White, and the quality of White depends on the primary light sources.
LED COB performs quite well in providing homogeneous illumination and SMD cannot achieve the same effect.
Generally speaking, the chip-on-board one can realize high-intensity homogeneous light emission while the other performs better in the flexibility of colors.
Professional manufacturers always utilize LED COB bulbs to make their products. Because of its luminous uniformity, you can use the portable COB LED light for photography and films. The COLBOR CL100 is such a good choice. It offers constant 100W output and features an intelligent temperature control system to ensure optimal working temperature.
Its unmatched compactness also provides great convenience for users to carry it around for outdoor and mobile filming especially when it is a COB rechargeable light.
Industrial sites like mining industries, car factories, and warehouses are typical examples that need those with high-density lumens for a coverage of large area. High intensity and great uniformity make COB chips well suited for this case.In the architectural field, LED COB is widely used for sophisticated display. It is convenient to use reflectors to control the light beam. COB ceiling lights and downlights are commonly seen in residential design. They are so lightweight that they can be easily installed without damaging the aesthetics of the ceilings. In addition, COB LED flex strips are often used to decorate the outer walls of the buildings.In agricultural and horticultural fields, chip-on-board grow light is popular because it contributes to the better growth and higher output of plants, vegetables, and flowers indoor.All in all, with great efficiency and outstanding effects, the LED COBs gain a foothold in the industry. It is palpable that it might become the future of lighting.
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