What are CoB LEDs?
A CoB LED, also known as a chip-on-board LED, is a single component made up of several LED chips installed on a thermally efficient substrate that is covered with a homogeneous layer of phosphor.
A chip-on-board LED (CoB) is most frequently used to provide illumination for recessed or track lighting in a building or residence. Because they produce brilliant white light from a small light source and are very effective in a variety of applications, CoBs are frequently employed.
In what ways does a CoB LED vary from other kinds of LEDs?
The term "CoB" (chip-on-board) describes how the LED unit is put together. White CoB LEDs' fundamental components are:
a power source that uses electricity to power the LED
the 'die', or light-emitting chip. This is also known as the "blue light pump" and is constructed of the semiconductor material indium gallium nitride (InGaN), which when activated releases blue photons. The blue light is then transformed into white by a phosphor coating. Controlling the phosphor's chemical makeup results in light with a predetermined colour temperature.
Space-Saving Array of Several LED Chips: CoB LED
A CoB LED is a single unit that consists of several LED chips put on a thermally efficient board. Each chip is bare, meaning it lacks a leadframe, phosphor coating, or lens of its own. As a result, the chips may be put on the substrate very tightly together. When compared to single packed LEDs, the proximity of the LED chips enables more intensity or light density to be emitted from a smaller area. The complete array of chips in the CoB LED manufacturer's chip array are then uniformly coated with phosphor to transform the blue light into the necessary white colour temperature.
The benefits of a CoB LED
A CoB LED may have a thick array of hundreds of chips inside of it. In comparison to an array of packed LEDs, a CoB LED can emit more light from a smaller space because to its dense array.
A single LED may provide optical benefits for homogeneous light and effective optics, as well as simpler design and product.
The CoB LED only needs a single two-wire power source to power the full array of chips, simplifying electrical architecture. The image of the LUXEON CoB Core Range products above clearly shows the positive and negative terminals of a CoB LED. An array of packed LEDs, on the other hand, needs specific power supply traces routed on the PCB to each LED unit.
If a CoB LED is used instead of a group of packaged LEDs, production will be easier since fewer units will need to be soldered to the board.
Optically, CoBs of various sizes may be used with a wide variety of optics, often reflectors, to control the direction and breadth of the beam, as with a spot or flood lamp.
Finally, a CoB LED's colour may be more constant since just one phosphor coating is applied to the whole array of chips, as opposed to one phosphor coating for each LED unit in a packaged LED array.
