1、 Series connection method 

This series connection method has a relatively simple circuit, with the head and tail connected together. The current flowing through the LED during operation is consistent and good. As the LED is a current type device, it can basically ensure that the luminous intensity of each LED is consistent. The circuit using this LED connection method is simple and convenient to connect. But there is also a fatal drawback, which is that when one of the LEDs experiences an open circuit fault, it will cause the entire LED string to go out, affecting the reliability of use. This requires ensuring that the quality of each LED is excellent, so the reliability will be correspondingly improved.

It is worth noting that if an LED constant voltage driving power supply is used to drive the LED, when one LED is short circuited, it will cause an increase in circuit current. When a certain value is reached, the LED will be damaged, resulting in all subsequent LEDs being damaged. However, if an LED constant current driving power supply is used to drive the LED, the current will remain basically unchanged when one LED is short circuited, and it will not affect the subsequent LEDs. Regardless of the driving method, once an LED opens, the entire circuit will not be illuminated.

2、 Parallel connection method

The characteristic of parallel connection is that the LED is connected in parallel from head to tail, and the voltage borne by each LED during operation is equal. However, the current may not necessarily be equal, even for LEDs of the same model and specification batch, due to factors such as production and manufacturing processes. Therefore, the uneven distribution of current in each LED may cause the lifespan of LED with excessive current to decrease compared to other LEDs, and over time, it is easy to burn out. This parallel connection method has a relatively simple circuit, but its reliability is also not high, especially when there are many LEDs, the possibility of failure is higher.

It is worth noting that the parallel connection method requires a lower voltage, but due to the different forward voltage drop of each LED, the brightness of each LED is different. In addition, if one LED is short circuited, the entire circuit will be short circuited, and the other LEDs will not work properly. For a certain LED that is open circuited, if constant current drive is used, the current allocated to the remaining LEDs will increase, which may cause damage to the remaining LEDs. However, using constant voltage drive will not affect the normal operation of the entire LED circuit.

3、 Hybrid connection method

Hybrid connection is a combination of series and parallel connections. Firstly, several LEDs are connected in series and then connected in parallel to both ends of the LED driver power supply. Under the condition of basic consistency of the LEDs, this connection method ensures that the voltage of all branches is basically equal, and the current flowing through each branch is also basically the same.

It is worth noting that the use of hybrid connection is mainly applied in situations with a large number of LEDs, because this method ensures that LED faults in each branch only affect the normal lighting of the branch at most, which improves reliability compared to simple series and parallel connections. Currently, many high-power LED lamps commonly use this method to achieve practical results.

4、 Array method

The main composition of the array method is as follows: branches are composed of three LEDs in a group, respectively