What is a COB LED?
The lighting industry is moving at a fast pace with continual new developments which are helping find solutions for many of our lighting needs. If you are wondering: “What is a COB LED?” then maybe we can help you understand.
What is a COB LED Light?
Chip on board (COB) LEDs are relatively new on the market, but despite their brief history, they offer many benefits when compared to the standard options. The first lights which can be considered similar to COB packages made their first appearance at the beginning of the 21st century and are the SMD LED packages. The COB light as we know it now first became available in 2007 and was met with skepticism because of the small packaging which contained so much power.
Sometimes they are called “fried eggs” because when not lit they resemble them. This is because of the yellow phosphor circle which is mounted on a white board.
Multiple LED chips are bonded by the manufacturer onto a substrate to form a single module called a COB LED. Typically nine or more LED chips are used and they are mounted in such a way as to offer the highest potential of lighting possible. When a COB LED package is lit, it has the effect of a lighting panel as opposed to looking like multiple individual lights.
What are the benefits of COB LEDs?
The lumen output per square inch for a COB LED is greatly increased in efficiency because of the multi-chip packaging. The reason for this is that the globe with LED diode chips has far more light sources covering the same are of a traditional LED. In COB LEDs, the viewing angle is increased and the loss of light is decreased since the lenses and other traditional LED packaging components are eliminated.
Since fewer components are required per LED chip to function correctly, the multiple diodes are housed within the COB LED with a single circuit and two contacts which energize them.
The greatest advantage because of the reduced components and the elimination of the traditional LED chip structure package is the reduction of heat generated by each LED chip. The operational temperature of the COB LED is also lowered because of the calcium/aluminum substrate which is often coupled to an external heat sink because it is a higher efficiency heat transfer medium. In order for a COB to be used at its full potential, care must be taken when choosing a heat sink. It must be capable of dissipating the heat generated so that the COB LED will work at increased efficiency and with lower failure rates.
The fact that spot soldering of the individual LED diode chips is not necessary, since mounting is done directly onto the substrate, is another reason why COB LEDs have reduced failure rates.
The advantages in short:
High-Intensity at short distances
Simplicity of design
High-uniformity at close working distances
Increased life, stability and reliability
What are the disadvantages of COB LEDs?
They cannot be used to create color changing bulbs or lights because of their limited contacts and circuit. So they are only efficient in single color applications.
Where are COB LEDs used?
The COB LED allows for heavy-duty applications, something which could not be done with LEDs.
There are a wide range of applications possible for COB LEDs and they could be used for higher output general lighting. However, their primary application would be as solid-state lighting (SSL) by replacing metal-halide lams. These are used for high-bay lighting, street lights, high-output track lights, and down-lights and are used in theatres and as grow lights.
In smaller applications we see COB chips in the flash of mobile phones and a point-and-shoot camera.
Almost every light source can be replaced with COB LED. They are the latest and most advanced technology in lighting existing on the market today. They are available in anything from a few hundred lumens to 30,000 lumens and can go up to 200 watts.
COB LEDS have proven to be a major step in LED lighting technology and have increased the capabilities of the power that can be included in the same size as an ordinary LED packaging. Their availability for all kinds of lighting situations has been increased by manufacturers who have produced a wide range of options for consumers to choose from.