COB (Chip On Board) and SMD LED (Surface Mounted Device Light Emitting Diode) lamps are two major lighting technologies that bring significant improvements in the world of modern lighting. In this article, we will discuss the differences between these two types of lights, as well as the applications and advantages of each.
What Are COB Lights?
COB lights, or Chip On Board, are a lighting technology that integrates many small diodes on a single board. This creates a light source that is highly concentrated and has a high output commensurate with its input power. These diode collections are arranged in parallel and series to produce a “chip” that provides high intensity light.
What are SMD LED lights?
SMD LED, or Surface Mounted Device Light Emitting Diode, is a lighting device that has a smaller LED diode and lower light output compared to COB LED. SMD LEDs are generally mounted on a PCB (Printed Circuit Board) and require an external diffuser to direct the light.
Advantages of COB Lamps
COB lamps have several advantages that make them superior in many aspects:
- High Lumens: COB LEDs are capable of producing more than 1.5 times the lumens per watt compared to SMD LEDs. This means the lighting efficiency is very high.
- High Light Concentration: Multi-diode integration in a COB creates highly focused light, which is useful in a variety of lighting applications.
- Compact Size: The compact size of COBs results in increased lumens per square centimeter or inch, optimizing space and lighting efficiency.
- Low Operating Temperature: COB LEDs have lower operating temperatures due to ease of mounting on external heat sinks. This also increases the life and reliability of the device, saving maintenance costs.
- Large Focusing Area: COB LEDs can cover larger areas with a single chip, making them ideal for a variety of lighting applications.
- Decreased Light Loss: The use of clear lenses on COBs reduces light loss, increases clarity and lighting efficiency.
COB Lamp Application
A variety of applications can utilize COB LED technology, including:
- Living Room Lighting: COB LED with wide angle beam is suitable for lighting living rooms and large halls.
- High Illumination: COB LEDs are used in street lights, high bay lighting, and downlights.
- Stadium and Night Park: Large stadiums, playgrounds and parks that require high lighting at night utilize COB LEDs.
Disadvantages of COB Lamps
Even though they have many advantages, COB lamps also have several disadvantages:
- Repair Difficulty: If any single diode in the entire COB experiences a technical failure, then the complete COB must be replaced, which can be a higher cost.
- Heat Sink Requirements: COB LEDs require a well-designed heat sink because they produce heavy heat. If the heat sink is installed incorrectly, the diode may explode.
- External Power Supply: COB LEDs require an external power supply with high current and constant voltage capabilities.
- More Expensive Fees: COB LEDs tend to be more expensive compared to SMD LEDs.
Difference Between COB LED and SMD LED
The following table provides a comparison between COB and SMD LED lights:
|COB LED lights
|150 lm/watt @350mA to 250 lm/watt @ 20mA
|~100 lm/watt @300mA
|Medium to Hard
|Quite lower than COB LED
|External Power Supply
|An external power supply with high current capability is a must
|Lower current capability required
|A larger heat sink with cooling fan is a must because of the heavy heat dissipation
|A smaller heat sink will work
What Are LED Drivers?
An LED driver is an external power supply used to operate an LED. It converts high alternating voltage to lower DC voltage to power the LED. LED drivers are critical in maintaining LED performance and longevity.
In conclusion, both COB and SMD LED lamps have their own characteristics and applications. The choice between the two should be based on the specific needs and budget of your lighting project.
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