The reason for the yellowing of the LED outer sealant is mostly due to the mismatch between the epoxy resin and the curing agent, but it cannot be ruled out that the baking time of the outer sealant is too long.

The reason for the leakage of LED lamp beads: improper electrostatic protection. Then there is the packaging process, the welding wire PAD is biased, and finally the hidden quality problem of the chip itself.

The LED lamp bead should be a problem of capacitive and inductive loads: in fact, it is neither. The LED lamp bead is a diode. It needs a forward conduction voltage to work, usually 2-3.5V. In addition, the current The size can control the brightness of the LED lamp beads. That is to say, LED lamp beads only convert electrical energy into light energy.

There are four reasons for the attenuation of LED lamp beads: There are four reasons for the attenuation of low-power LEDs: 1: The iron bracket has poor thermal conductivity. Two: epoxy resin yellowing. Three: The chip and the bracket are not in close contact with each other. Four: Chip attenuation is large. If it is white light, there is also the problem of phosphor attenuation.