Which is Better, LED Lamp Beads and SMD SMD LEDs?

There are many types of SMD LEDs.

From the packaging volume points: 3528, 2835, 3535, 5050, 5630, and so on. It is widely used in lighting fixtures. The processing method is generally: reflow soldering. (Divided into low temperature welding, low temperature welding, high temperature welding) In addition, the gap of the chip LED is generally negative. (Depending on the packaging method, it will change.) SMD lamp beads are cheap and can be mass-produced; high-power lamp beads have high brightness, long life and convenient DIY.

SMD LED is the meaning of surface-mount light-emitting diodes. SMD patches help improve production efficiency and applications in different facilities. It is a solid-state semiconductor device that can directly convert electricity into light. Its voltage is 1.9-3.2V, and the voltage of red light and yellow light is the lowest. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply. Encapsulated in epoxy resin. A semiconductor wafer consists of two parts, one is a P-type semiconductor, where holes dominate, and the other end is an N-type semiconductor, which is mainly electrons. But when these two semiconductors are connected, a P-N junction is formed between them. When a current is applied to the chip through a wire, the electrons are pushed to the P region, where the electrons and holes recombine, and then energy is emitted in the form of photons. This is the principle of LED light emission. The wavelength of light, which is the color of light, is determined by the material that forms the P-N junction.

LED in English (light-emitting diode), LED  is the English abbreviation of LED lamp beads for short, which is a popular name.

LED lamp beads features:

1. Stability: 100,000 hours, the light decay is 50% of the initial.

2. Response time: The response time of the incandescent lamp is at the millisecond level, and the response time of the LED lamp is at the nanosecond level.

3. Environmental pollution: no harmful metal mercury.

4. Voltage: LED lamp beads use low-voltage power supply, the power supply voltage is between 2-4V, which varies depending on the product, so it is a safer power supply than using high-voltage power supply, especially suitable for public places;

5. Current: working current is 0-15mA, the brightness varies with the increase of current

6. Efficiency: 80% less energy consumption than incandescent lamps with the same light efficiency.

7. Applicability: Very small, each unit LED chip is a 3-5mm square, so it can be prepared into devices of various shapes, and suitable for variable environments.

8. Color: The color can be changed by changing the current. The light-emitting diodes can be easily chemically modified to adjust the band structure and band gap of the material to achieve red, yellow, green, blue, and orange multicolor light emission. For example, an LED that is red at low currents can turn orange, yellow, and finally green as the current increases.