Light-Emitting Diode (LED) is a semiconductor device that emits light when a current passes through it. When particles carrying electrical current (called electrons and holes) are combined within a semiconductor material, light is produced. Basically, LEDs are small lamp beads, which are easy to install into the circuit. But unlike incandescent lamps, it does not burn filaments, consumes less electricity, and does not generate a lot of heat. They are illuminated only by the movement of electrons in semiconductor materials and have a lifetime as long as standard transistors. The service life of LEDs is thousands of hours longer than that of incandescent bulbs. Because of these advantages, LEDs are one of the most popular technologies for lighting lamps. It is mainly divided into three types, DIP LED, SMD LED, COB LED.
Dual In-Line Package (DIP) LEDs
Dual-in-line package (DIP) LED, which the chip inside a hard plastic bulbous head, with 2 straight parallel connecting pins. Although some products still use this design today, its light attenuation and CRI are low, but its efficiency is far less than that of new LED chips. Today, more advanced LED chip styles are available for home, commercial, and industrial use.
dip led
Chip-on-Board (COB) LED Design
Chip-on-board (COB) refers to sticking several chips (usually 9 or more) on an aluminum substrate and packaging them together as a lighting module. This design takes up less space and provides maximum light potential. This technology eliminates the concept of brackets, no electroplating, no-reflow soldering, and no placement process, so the process is reduced by nearly one third and the cost is also saved by one third. You will see them used in loading docks, factories, warehouses, delivery areas, and other industrial applications. COB lights often appear in high-output downlights and track lights. They are also used for street lights, parking lots, and outdoor facilities that require large areas of lighting.
cob led
Surface Mounted Device (SMD) LED Chips
Surface Mounted Device (SMD) LED Chips is the next major development after DIP. Compared with traditional LEDs, the light output generated by SMD is much higher and consumes less power. Compared with DIP LED they have a smaller, flatter design, longer service life, reduced energy consumption by up to 75%, and lower maintenance costs.
smd led
Next, we will introduce SMD LED chips by timeline, 3528-3014-5050-5630-3030-2835-3535
The size of the 3528 SMD is 3.5*2.8*1.9mm. You can usually find the 3528 chip on the 12v LED strip. It emits less heat, so it is safer to touch them than halogen lamps. As long as the LED light bar is used for minimum lighting requirements, it can be easily installed anywhere.
The 3014 SMD is 3.0*1.4*0.8mm. The smaller size means that more LEDs are mounted on a certain length of the PCB board. This LED chip has low light decay, low thermal resistance, and good thermal conductivity.
The size of 5050 SMD is 5.0*5.0*1.6mm, which is larger than 3528SMD. It can be used as ‘quad LEDs’ with 4 LEDs. 5050 LED chips are often used on 60 LED-per-metre strip lights, suitable for general lightings, such as corridor lighting in homes, bars, restaurants, hotels, and other places, replacing fluorescent lighting.
The 5630 SMD is 5.6*3.0*0.9mm. Compared with 5050SMD, it has the characteristics of high brightness, uniform illumination, small light effect, and long life. It is used for commercial purposes in shopping malls, clubs, theaters, and restaurants. Other uses include architectural lighting, security and emergency lighting, backlighting, signage lights, and special events and conferences and exhibitions.
3030 SMD size is 3.0*3.0*0.52mm, it is a low power consumption wide light angle lamp bead. It not only produces the highest light output but also has the best flux performance. The 3030 SMD can be driven by a large current, and can effectively dissipate heat. These LED Chips can work under various environmental conditions and are suitable for industrial and commercial lighting applications. Whether BW lighting is an indoor or outdoor lighting product, it is applied to this SMD LED.
The size of 2835 SMD is 2.8*3.8*0.8mm, and its circuit board is the same as in 3528. You can think of 2835 as a more effective alternative to 5050-producing 20% light, but consuming less power. It is very popular in the market and is now widely used. 2835 SMD is usually used for general indoor lighting, such as high bay light, linear light, vapor proof light, etc. Indoor lighting of XSY lighting is also more inclined to use these LED chips.
The size of 3535 SMD is 3.5*3.5*1.9mm. At present, it mainly refers to ceramic packaged high-power LEDs. It has good thermal conductivity, high-temperature resistance, strong center illumination, and is suitable for outdoor high-power products, such as floodlights, street lights, stadium lights, etc.
In general, according to our many years of experience in the production and sales of led light fixtures, only a small number of DIP LED products currently on the market will use it. Although the acceptance of COB is higher than that of DIP, the most popular is SMD technology.
