First, it is necessary to have a basic understanding of surface mount device (SMD) LEDs. They are undoubtedly the most frequently used LEDs at present. Due to their versatility, LED chips are firmly fused to printed circuit boards and widely used even in smartphone notification lights. One of the most notable features of SMD LED chips is the number of connections and diodes.
On an SMD LED chip, there can be more than two connections. Up to three diodes with independent circuits can be found on a single chip. Each circuit has an anode and a cathode, resulting in 2, 4, or 6 connections on the chip.
Differences between COB LEDs and SMD LEDs
On a single SMD LED chip, there can be up to three diodes, each with its own circuit. Each circuit in such a chip has a cathode and an anode, resulting in 2, 4, or 6 connections. COB chips usually have nine or more diodes. In addition, COB chips have two connections and one circuit regardless of the number of diodes. Due to this simple circuit design, COB LED lights have a panel-like appearance, while SMD LED lights look like a group of small lights.
Red, green, and blue diodes can exist on an SMD LED chip. By varying the output levels of the three diodes, you can produce any hue. On a COB LED lamp, however, there are only two contacts and a circuit. It is not possible to make a color-changing lamp or bulb with them. Multi-channel adjustment is required to get a color-changing effect. Therefore, COB LED lamps work well in applications that require a single hue rather than multiple colors.
The brightness range of SMD chips is well known to be 50 to 100 lumens per watt. COB is well known for its high thermal efficiency and lumen per watt ratio. If a COB chip has at least 80 lumens per watt, it can emit more lumens with less electricity. It can be used in many different types of bulbs and devices, such as mobile phone flash or point-and-shoot cameras.
In addition to this, SMD LED chips require a smaller external energy source, while COB LED chips require a larger external energy source.
Post time: Nov-18-2024