Top 5 things you need to know about COB LED

We’ve probably heard that two heads are better than one. When it comes to COB leds, this is also the principle used in most LED chip packages. So there are many different chip packages to choose from. That means you get surface mount diodes, chip onboard leds, multichip onboard leds, multichip and cup onboard packages.

Nevertheless, in this guide, we will take a look at COB leds and what exactly they are. You will find them very useful. For example, you can use it in your next DIY LED Grow Lighting project. But first, let’s look at what a COB LED is and how it works.

What are COB LEDs and how do COB LED lights work?

As we described in the introduction, COB stands for chip on board. The technology has only entered the market in the past decade. Therefore, we can consider it relatively new compared to other standards.COB LEDs consist of multiple LED chips that are combined and glued together to form a module. There are usually nine (or more) chips in a module. As you know, this equates to more intense lighting, up to 250 lumens (at 20ma) on a large chip. Also, they appear as one light, not multiple lights.

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Advantages and disadvantages of COB leds

In this section, we will cover some of the advantages and disadvantages of using COB LED lighting.


  •         Greater thermal resistance (especially when paired with LED heat sinks)
  •         Pocket
  •         High light efficiency
  •         Better lighting
  •         Larger cooling area
  •         They require a circuit with two power contacts.
  •         Lower failure rate due to fewer solder joints
  •         Strong earthquake resistance


  •         Limited number of colors
  •         The light efficiency decreases with the size of the chip.

Applications and uses of COB leds

You may be curious about how to use COB leds. Maybe this part will give you some inspiration. In it, we will introduce some uses and applications of COB leds.

  •         Street light
  •         Household lamps
  •         High Bay Lighting
  •         LED lights
  •         Downlight
  •         Simple lighting for passages and hallways
  •         Playground lighting
  •         Alternative to fluorescent lamps
  •         Smartphone camera flash
  •         Light strip

COB leds and SMD leds

SMD (Surface Mount Device) LEDs are the most popular leds on the market today. You can think of them as the predecessors of COB LED. Smds are very similar to COB LEDs in that they do not require direct contact with wires. Instead, they use tiny metal contacts to function.

PCBs are usually square or rectangular. You can identify the LED chip by the location of the SMD. It looks like a small black dot in the center of the PCB. The SMD is available in a variety of sizes including 2835 (2.8 x 3.5mm), 3030 (3.0 x 3.0mm) and 3014 (3.5 x 2.8mm). It can also be found in sizes 5050 (5.0 x 5.0 mm) and 5630 (5.6 x 3.0 mm).

Flexible COB LED StripEarlier, we briefly introduced SMD LEDs and compared them to COB LEDs. Typically, an SMD consists of an LED chip, a phosphor package, an L-shaped solder joint, and a plastic reflector.

Flexible light strips use miniaturized versions of COB LEDs. Hence why their design may be a bit simpler than SMD. They consist of a phosphor film, a chip, and solder joints underneath. Hence why we use it in LED strips. We pressed the flip chip LED in the middle of the light bar. You can find up to 512 LEDs per meter. The biggest advantage of COB-based LED flexible strips is that there are no LED hot spots. Hotspots are areas of inconsistent brightness on the SMD LED flex strip.COB Flex strips produce smooth, consistent strip lighting. COB LED flexible strips are also brighter than SMD-based strips. Due to the smaller size of the diodes, they are more flexible and generate less heat. You can cut and shave it.

COB LED lights

As you can see, COB LEDs are very important. Also, it can be used to create various projects such as COB LED Grow Lights. If you do not have a green finger and do not like plants, you can always make your own COB LED light.

You can do this with personalized COB LED strips, individual modules, or COB LED bulbs. The fact that you can replace the high-intensity discharge with LED corncob lights further highlights their usefulness. What is an LED corncob light? They are large bulbs that use a row of individual COB LEDs to emit a strong light. Because of their efficiency, most people consider them a viable replacement for metal halide bulbs.

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