What are LED components – LED Packages
LED packages are assemblies that host the LED chip. There are many types of LED packages in use today, each with particular applications and advantages. The purposes of LED packages include:
- Protect LED chip and welded conductive cables from direct contact with the environment.
- Secure and encapsulate the chip with LED phosphors and silicone epoxy resin
- Allowing versatility and standardization in LED lighting applications
LED packages are crucial LED components that allow the lighting unit to connect the LED light source. When you want to purchase or purchase LED lights, be sure to ask your representative what type of LED packaging (and how many packages) are used in the product.
What are the main types of LED packages?
These LED packages are the most traditional types, commonly seen in indicator lamps. Recently, the development of white LEDs has allowed them to be used in lighting applications such as signals and also in standard commercial and residential lighting applications. They consist of a double-tipped aluminum frame with the LED chip in a small depression at one end of the teeth.
The gold wires are welded, connecting the terminals to the two parts of the frames. The exterior is composed of epoxy encapsulation to protect the entire component. They consume relatively low power, with a rated power of approximately 0.1 W, releasing approximately 10 lumens each (by comparison, a 60 watt incandescent bulb emits approximately 800 lumens).
SMD (surface mount devices)
SMD, short for "Surface Mount Device", describes LED packages that can be mounted on a surface (usually PCB) by welding. SMDs come in all shapes and sizes, and are usually described with a four-digit number. 3528 SMD and 5050 SMD are currently some of the most commonly used SMDs. The four-digit numbers refer to the length and width dimensions of the MDS, in this case 3.5 x 2.8 mm and 5.0 x 5.0 mm, respectively.
After being welded to circuit boards, these are typically used in LED lights or backlight for computer monitors or TV screens. The output light and the power consumed depend on the LED chip, the pickups used in 3528 are usually in line with the types of F5 lamps, at approximately 0.1 W and up to 10 lumens output. For larger packages that have effective heat dissipation methods, greater power and light output is possible. The packaging material is usually made of ceramic or plastic, although many plastics cannot withstand the high junction temperature of the LED.
SMDs are a very popular packaging method due to their excellent versatility. They are often used in LED light strips and can be installed in a variety of locations. For example, take a look at this lighting exhibition in Beijing.
High-power LEDs are usually suitable for powering between 1 and 3 W of chips. They can release a couple of hundred lumens each and are most commonly used in spotlights, bulb lights and reading lamps. For example, a 1W or 3W reflector usually uses only one high-power LED package as a light source. For higher power, more of these high-power LEDs are used.
This 5W bulb uses 5 packs of 1W high power LED.
The COB (chip-on-board) LED modules have multiple LED chips mounted on a single PCB, encapsulated in a mixture of phosphor and epoxy. These modules can reach many hundreds of watts, delivering more than 10000 lumens. They can often be used in high-rise or outdoor lighting.
The 10×10 matrix of LED chips (1W each) are visible in this 100W COB LED matrix module.
How does packaging affect LED light?
When manufacturers decide what type of package to use, several factors are considered. The main factors are the footprint (the size of the packet and the amount of space it will consume), the ability to dissipate the heat and the emission angle. For example, an LED tube is better equipped with SMD because if high power LEDs are used, the space between the LEDs will be too large, creating a tube that emits light of perhaps only 20 points along a 1.2 m tube. While SMDs (as used in our products) allow light to be evenly distributed at up to approximately 270 points from different light sources, creating a much more even tube light. Each application has its own different requirements and requires a thorough analysis to determine the appropriate package type.