Ordinary LED lights have 2 pins. Why do these LED lights have 4 pins?

Ordinary light-emitting diodes (LED lights) only have two pins, one long pin and one short pin. Connect the long leg to the positive pole of the power supply, and the short leg to the negative pole of the power supply. Besides this ordinary LED light with only two pins, can you take a look at any LED lights with 4 pins?
Although there are four pins inside, there are actually three LED beads, one of which is the common part of the three LEDs, and the other three are the second pin of each LED. LED lights also have a common cathode and a common anode. For a common anode RGB LED light, the longest of the four pins is the anode, which is the positive pole connected to the power supply.
If the red lead contacts the anode of the common anode RGB LED light, and the black lead contacts any of the other three pins. If the LED light is normal, you will also see that the LED light is on and it will be on the multimeter. The voltage drop displayed at this time is no different from the LED light that measured normally.

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