How to judge the quality of LED lamp beads

We all know that LED lamp beads can be divided into four categories according to their types: direct-plug lamp beads, SMD lamp beads, high-power LEDs, and COB lamp beads. These lamp beads have different packaging methods and different powers. So, how do you judge the quality of LED lamp beads? Let's take a look at the answer from Dongguan Xinyouwei Optoelectronics Technology!

1. Visual inspection: If the LED lamp bead has burns on the outside, or the chip inside is black, it means that the LED lamp bead is physically damaged.

2. If you have dry batteries on hand, you can use two 1.5V batteries: connect them in series to form 3V, connect them forward and backward, and if they don’t light up, they are bad. This is a simple way to judge whether the LED lamp beads are good or bad.

3. How to use a multimeter to measure and judge whether the LED lamp beads are good or bad.

a. Use the red pen of the multimeter to connect the positive contact point of the LED lamp bead, and the black pen of the multimeter to connect the negative contact point. When the LED lamp bead is slightly bright, it is good, otherwise it may be broken.

b. If you use a digital multimeter, use the diode measurement block to measure the positive and negative poles of the LED lamp bead to connect and disconnect. If you use a pointer multimeter, use the 10KQ block to measure. When it is turned on, you can visually see that the LED lamp bead is slightly bright, which means it is a good LED lamp bead. Otherwise, the lamp bead may be broken.

4. Simple judgment method of LED test pen. If it is used for maintenance or selection, you can buy one from the omnipotent Xbao. The price is not expensive, only a few dozen yuan, and it is very easy to use.

In addition, Xinyouwei said that the following two methods can also be used to judge the quality of LED lamp beads: use the LED lamp for a while to see how long its light decays. If it becomes dark after a while, it means that the quality of the LED lamp beads is poor; then look at its heat dissipation. If the LED lamp becomes hot, it means that the quality of the LED lamp beads is poor.