What is High Cri Cob Led and Why Do We Use Them?

High CRI means that the color rendering index of artificial standard light source is close to that of sunlight. The higher the color consistency of the same object illuminated by the tested light source and the standard light source, the greater the Ra, the better the color rendering performance, and vice versa. In recent years, with the rapid development of LEDs, high Ra products are no longer a technical barrier, so many branded suppliers have begun to launch their own high CRI COB products.

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In indoor lighting engineering, due to the diversity of illuminated objects (such as people, prints, fabrics, etc.), rich colors, close viewing distance, and high requirements for color reproduction accuracy, designers usually choose high-definition products, requiring Ra> 90 .

The COB led strip is a strip that encapsulates chips on a flexible board. Most of the chips are flip-chip, which are linearly packaged on the PCB, and then a layer of encapsulant mixed with phosphor is directly dropped on the surface of the chip. The high-definition index COB light strip adopts high-density leds, 320 leds/m -480 leds/m, which ensures the high consistency of product color, uniform and linear light emission, and pure and bright light color. Traditional light strips only have dozens of lamp beads to one hundred leds, and the purity and uniformity of light are unmatched by COB led strips.

However, is the higher the cri of the led lamp, the better? By comparing and analyzing the color temperature, color rendering index and luminous flux of different light sources, it is found that the higher the cri of most light sources, the lower the luminous flux, that is, the lower the luminous efficiency. Low Ra means that the brightness of the lamp is slightly higher, and high Ra means that the color of the lamp is slightly better, and there is a visual difference, but not much. In the case of low scene accuracy and limited investment budget: From a more economical point of view, the requirement for Color rendering requirements can be moderately reduced, and CRI > 80° is enough, especially for outdoor lighting scenarios.

Generally speaking, high cri cob led strips take into account the high visibility of lighting products, no dark spots, and uniform lighting. It is very suitable for indoor and outdoor lighting design, convenient for transportation and cutting, and has been widely used in hotels, exhibition halls, shops, car tail lights and other fields.

What are CoB LEDs?

LUXEON CoB Finder

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?

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CoB (chip-on-board) refers to the way in which the LED unit is constructed. The basic elements of white CoB LEDs are:

• An electrical power supply to provide the energy to drive the LED
• The light-emitting chip or &#;die&#;. This is sometimes referred to as the blue light pump, and is made of a semiconductor material, indium gallium nitride (InGaN), which emits blue photons when energized
• A phosphor coating which converts the blue light to white. The chemical composition of the phosphor is controlled to produce light of a specific color temperature

CoB LED: Space-Saving Array of Multiple LED Chips

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.

Advantages 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.

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CoB LEDs from Lumileds